This paper analyzes the text of 3261 clauses of 20 RTAs signed by China,classifies them into 52 policy areas according to the international mainstream HMS method,and assigns them through coding.The clause depth of Ch...This paper analyzes the text of 3261 clauses of 20 RTAs signed by China,classifies them into 52 policy areas according to the international mainstream HMS method,and assigns them through coding.The clause depth of China’s RTAs is measured across three-dimensional systems(policy areas,clauses,and core clauses)and two generations of trade policy areas(WTO+,WTO-X,and all policy areas).It is observed that China’s RTAs exhibit greater depth in Industrial Products,Agricultural Products,TBT,Antidumping,Countervailing,and Investment,while showing comparatively less depth in Fiscal Policy,Innovation Policies,and related areas.展开更多
Chile,a pioneer and benchmark partner for China's free trade.cooperation in Latin America,holds a special position in China-Latin America economic and trade relations.It was the first Latin American country to sig...Chile,a pioneer and benchmark partner for China's free trade.cooperation in Latin America,holds a special position in China-Latin America economic and trade relations.It was the first Latin American country to sign a bilateral free trade agreement with China and the first to reach an upgraded protocol.Chile also established mutual recognition of Authorized Economic Operators(AEO)with China,the first country in South America to do so.展开更多
As the adoption of Vehicular Ad-hoc Networks(VANETs)grows,ensuring secure communication between smart vehicles and remote application servers(APPs)has become a critical challenge.While existing solutions focus on vari...As the adoption of Vehicular Ad-hoc Networks(VANETs)grows,ensuring secure communication between smart vehicles and remote application servers(APPs)has become a critical challenge.While existing solutions focus on various aspects of security,gaps remain in addressing both high security requirements and the resource-constrained nature of VANET environments.This paper proposes an extended-Kerberos protocol that integrates Physical Unclonable Function(PUF)for authentication and key agreement,offering a comprehensive solution to the security challenges in VANETs.The protocol facilitates mutual authentication and secure key agreement between vehicles and APPs,ensuring the confidentiality and integrity of vehicle-to-network(V2N)communications and preventing malicious data injection.Notably,by replacing traditional Kerberos password authentication with Challenge-Response Pairs(CRPs)generated by PUF,the protocol significantly reduces the risk of key leakage.The inherent properties of PUF—such as unclonability and unpredictability—make it an ideal defense against physical attacks,including intrusion,semi-intrusion,and side-channel attacks.The results of this study demonstrate that this approach not only enhances security but also optimizes communication efficiency,reduces latency,and improves overall user experience.The analysis proves that our protocol achieves at least 86%improvement in computational efficiency compared to some existed protocols.This is particularly crucial in resource-constrained VANET environments,where it enables efficient data transmission between vehicles and applications,reduces latency,and enhances the overall user experience.展开更多
With the rapid development and widespread adoption of Internet of Things(IoT)technology,the innovative concept of the Internet of Vehicles(IoV)has emerged,ushering in a new era of intelligent transportation.Since vehi...With the rapid development and widespread adoption of Internet of Things(IoT)technology,the innovative concept of the Internet of Vehicles(IoV)has emerged,ushering in a new era of intelligent transportation.Since vehicles are mobile entities,they move across different domains and need to communicate with the Roadside Unit(RSU)in various regions.However,open environments are highly susceptible to becoming targets for attackers,posing significant risks of malicious attacks.Therefore,it is crucial to design a secure authentication protocol to ensure the security of communication between vehicles and RSUs,particularly in scenarios where vehicles cross domains.In this paper,we propose a provably secure cross-domain authentication and key agreement protocol for IoV.Our protocol comprises two authentication phases:intra-domain authentication and cross-domain authentication.To ensure the security of our protocol,we conducted rigorous analyses based on the ROR(Real-or-Random)model and Scyther.Finally,we show in-depth comparisons of our protocol with existing ones from both security and performance perspectives,fully demonstrating its security and efficiency.展开更多
Unmanned Aerial Vehicles(UAVs)are increasingly recognized for their pivotal role in military and civilian applications,serving as essential technology for transmitting,evaluating,and gathering information.Unfortunatel...Unmanned Aerial Vehicles(UAVs)are increasingly recognized for their pivotal role in military and civilian applications,serving as essential technology for transmitting,evaluating,and gathering information.Unfortunately,this crucial process often occurs through unsecured wireless connections,exposing it to numerous cyber-physical attacks.Furthermore,UAVs’limited onboard computing resources make it challenging to perform complex cryptographic operations.The main aim of constructing a cryptographic scheme is to provide substantial security while reducing the computation and communication costs.This article introduces an efficient and secure cross-domain Authenticated Key Agreement(AKA)scheme that uses Hyperelliptic Curve Cryptography(HECC).The HECC,a modified version of ECC with a smaller key size of 80 bits,is well-suited for use in UAVs.In addition,the proposed scheme is employed in a cross-domain environment that integrates a Public Key Infrastructure(PKI)at the receiving end and a Certificateless Cryptosystem(CLC)at the sending end.Integrating CLC with PKI improves network security by restricting the exposure of encryption keys only to the message’s sender and subsequent receiver.A security study employing ROM and ROR models,together with a comparative performance analysis,shows that the proposed scheme outperforms comparable existing schemes in terms of both efficiency and security.展开更多
Lignite provides energy security and contributes economically.However,it also causes dirty outcomes in terms of climate aspect.In addition to the energy and climate dimensions of the Sustainable Development Goals,ther...Lignite provides energy security and contributes economically.However,it also causes dirty outcomes in terms of climate aspect.In addition to the energy and climate dimensions of the Sustainable Development Goals,there is also a water issue:lignite is usually found submerged below the local groundwater tables.Mining lignite could be exploited to achieve drinkable and agriculturally usable water.In today’s literature,while the impact of lignite production on global warming and emissions are already highly discussed,the water management side of the issue is regularly omitted.However,considering the complex interlink between these three areas(the Water-Energy-Climate(WEC)nexus)is necessary within policy coherence,which is mostly ignored even though it is one of the development targets.Here in this framework,Turkiye,which aims to reduce its heavy dependency on energy imports,is worth studying because almost all of its coal,the country’s largest fossil resource,is lignite.Therefore,this study examines the WEC nexus related to lignite production and combustion and seeks policy coherence between their outputs in the context of Turkiye’s historical steps to climate change mitigation,specifically oriented with the Paris Agreement.This story expands from the absence of specific development policy objectives to the practicalities of politics and economics.展开更多
5G technology has endowed mobile communication terminals with features such as ultrawideband access,low latency,and high reliability transmission,which can complete the network access and interconnection of a large nu...5G technology has endowed mobile communication terminals with features such as ultrawideband access,low latency,and high reliability transmission,which can complete the network access and interconnection of a large number of devices,thus realizing richer application scenarios and constructing 5G-enabled vehicular networks.However,due to the vulnerability of wireless communication,vehicle privacy and communication security have become the key problems to be solved in vehicular networks.Moreover,the large-scale communication in the vehicular networks also makes the higher communication efficiency an inevitable requirement.In order to achieve efficient and secure communication while protecting vehicle privacy,this paper proposes a lightweight key agreement and key update scheme for 5G vehicular networks based on blockchain.Firstly,the key agreement is accomplished using certificateless public key cryptography,and based on the aggregate signature and the cooperation between the vehicle and the trusted authority,an efficient key updating method is proposed,which reduces the overhead and protects the privacy of the vehicle while ensuring the communication security.Secondly,by introducing blockchain and using smart contracts to load the vehicle public key table for key management,this meets the requirements of vehicle traceability and can dynamically track and revoke misbehaving vehicles.Finally,the formal security proof under the eck security model and the informal security analysis is conducted,it turns out that our scheme is more secure than other authentication schemes in the vehicular networks.Performance analysis shows that our scheme has lower overhead than existing schemes in terms of communication and computation.展开更多
With the recent advances in quantum computing,the key agreement algorithm based on traditional cryptography theory,which is applied to the Internet of Things(IoT)scenario,will no longer be secure due to the possibilit...With the recent advances in quantum computing,the key agreement algorithm based on traditional cryptography theory,which is applied to the Internet of Things(IoT)scenario,will no longer be secure due to the possibility of information leakage.In this paper,we propose a anti-quantum dynamic authenticated group key agreement scheme(AQDA-GKA)according to the ring-learning with errors(RLWE)problem,which is suitable for IoT environments.First,the proposed AQDA-GKA scheme can implement a group key agreement against quantum computing attacks by leveraging an RLWE-based key agreement mechanism.Second,this scheme can achieve dynamic node management,ensuring that any node can freely join or exit the current group.Third,we formally prove that the proposed scheme can resist quantum computing attacks as well as collusion attacks.Finally,the performance and security analysis reveals that the proposed AQDA-GKA scheme is secure and effective.展开更多
The Fourth Industrial Revolution has endowed the concept of state sovereignty with new era-specific connotations,leading to the emergence of the theory of data sovereignty.While countries refine their domestic legisla...The Fourth Industrial Revolution has endowed the concept of state sovereignty with new era-specific connotations,leading to the emergence of the theory of data sovereignty.While countries refine their domestic legislation to establish their data sovereignty,they are also actively engaging in the negotiation of cross-border data flow rules within international trade agreements to construct data sovereignty.During these negotiations,countries express differing regulatory claims,with some focusing on safeguarding sovereignty and protecting human rights,some prioritizing economic promotion and security assurance,and others targeting traditional and innovative digital trade barriers.These varied approaches reflect the tension between three pairs of values:collectivism and individualism,freedom and security,and tradition and innovation.Based on their distinct value pursuits,three representative models of data sovereignty construction have emerged globally.At the current juncture,when international rules for digital trade are still in their nascent stages,China should timely establish its data sovereignty rules,actively participate in global data sovereignty competition,and balance its sovereignty interests with other interests.Specifically,China should explore the scope of system-acceptable digital trade barriers through free trade zones;integrate domestic and international legal frameworks to ensure the alignment of China’s data governance legislation with its obligations under international trade agreements;and use the development of the“Digital Silk Road”as a starting point to prioritize the formation of digital trade rules with countries participating in the Belt and Road Initiative,promoting the Chinese solutions internationally.展开更多
Labor provisions have become a fundamental trade rule in regional and bilateral trade agreements.Although China’s legislation on pilot Free Trade Zones includes content related to labor protection,it primarily aligns...Labor provisions have become a fundamental trade rule in regional and bilateral trade agreements.Although China’s legislation on pilot Free Trade Zones includes content related to labor protection,it primarily aligns with labor indicators in“Doing Business”,the assessment of business situations issued by the World Bank.It differs from the labor rights protection focus emphasized in trade agreements.The latest strategic documents issued by the State Council of China have addressed this issue to fully achieve the goal of aligning Free Trade Zones with high-standard trade agreements.Building on the development of Free Trade Zone legislation and domestic labor law governance,China should proactively explore a tailored approach to labor provisions in Free Trade Agreements.In this approach,it should explicitly define the“baseline”and“ceiling”for labor provisions during negotiations and,within this framework,establish benchmarks for labor rights protection,enforcement mechanisms,and cross-border regulatory mechanisms suited to the specific conditions of the agreement parties.展开更多
On 19 June 2023,the Agreement under the United Nations Convention on the Law of the Sea on the Conservation and Sustainable Use of Marine Biological Diversity of Areas beyond National Jurisdiction(BBNJ Agreement)was a...On 19 June 2023,the Agreement under the United Nations Convention on the Law of the Sea on the Conservation and Sustainable Use of Marine Biological Diversity of Areas beyond National Jurisdiction(BBNJ Agreement)was adopted.The BBNJ Agreement aims to regulate the conservation and sustainable use of marine biodiversity in areas beyond national jurisdiction,including the high seas and the international seabed area.The BBNJ Agreement enters into an already crowded institutional landscape as a global authority with broad objectives,inevitably interacting with existing institutions,frameworks,and bodies(IFBs).Existing research has primarily focused on two areas:the first examines the impact of the institutions established by the BBNJ Agreement on existing marine governance IFBs;the second explores its influence on issues currently lacking institutional arrangements.However,comparatively little attention has been given to the Agreement’s potential impact on governance gaps within established systems.This paper takes the case of marine genetic resource(MGRs)management in the Antarctic Treaty Area to explore how the BBNJ Agreement may address regulatory gaps in a competent governance framework.Due to shortcomings in addressing core issues,concerning the legal status of MGRs access regulations,benefit-sharing mechanisms,and disclosure of origin,the Agreement is unlikely to have a significant impact on the governance of MGRs in the Antarctic Treaty System(ATS)in the short term.On the other hand,the ATS,as an effective governance framework for the Antarctic Treaty Area,has mature regulations and practical experience in Antarctic governance.Over the years,the ATS has focused on regulating bioprospecting activities as scientific research ones and strict environmental impact assessment procedures.However,there has not been an effective consensus on the regulation of commercial biological prospecting.This paper further explores the coordination issue between the BBNJ Agreement and the ATS,suggesting that in the future,MGRs governance in the Antarctic Treaty Area may evolve into a polycentric governance system.展开更多
As more satellite-derived land cover products used in the study of global change, especially climate modeling, assessing their quality has become vitally important. In this study, we developed a distance metric based ...As more satellite-derived land cover products used in the study of global change, especially climate modeling, assessing their quality has become vitally important. In this study, we developed a distance metric based on the parameters used in weather research and forecasting （WRF） to characterize the degree of disagreement among land cover products and to identify the tolerance for misclassification within the International Geosphere Biosphere Programme （IGBP） classification scheme. We determined the spatial degree of disagreement and then created maps of misclassification of Moderate Resolution Imaging Spectoradiometer （MODIS） products, and we calculated overall and class-specific accuracy and fuzzy agreement in a WRF model. Our results show a high level of agreement and high tolerance of misclassification in the WRF model between large-scale homogeneous landscapes, while a low level of agreement and tolerance of misclassification appeared in heterogeneous landscapes. The degree of disagreement varied significantly among seven regions of China. The class-specific accuracy and fuzzy agreement in MODIS Collection 4 and 5 products varied significantly. High accuracy and fuzzy agreement occurred in the following classes： water, grassland, cropland, and barren or sparsely vegetated. Misclassification mainly occurred among specific classes with similar plant functional types and low discriminative spectro-temporal signals. Some classes need to be improved further; the quality of MODIS land cover products across China still does not meet the common requirements of climate modeling. Our findings may have important implications for improving land surface parameterization for simulating climate and for better understanding the influence of the land cover change on climate.展开更多
Group Key Agreement(GKA)is a cryptographic primitive allowing two or more entities to negotiate a shared session key over public networks.In existing GKA models,it is an open problem to construct a one-round multi-par...Group Key Agreement(GKA)is a cryptographic primitive allowing two or more entities to negotiate a shared session key over public networks.In existing GKA models,it is an open problem to construct a one-round multi-party GKA protocol.Wu et al.recently proposed the concept of asymmetric group key agreement(ASGKA)and realized a one-round ASGKA protocol,which affirmatively answers the above open problem in a relaxed way.However,the ASGKA protocol only applies to static groups.To fill this gap,this paper proposes an extended ASGKA protocol based on the Wu et al.protocol.The extension allows any member to join and leave at any point,provided that the resulting group size is not greater than n.To validate the proposal,extensive experiments are performed and the experimental results show that our protocol is more effective than a plain realization of the Wu et al.protocol for dynamic groups.The extended protocol is also more efficient than the up-to-date dynamic GKA protocol in terms of communication and computation.展开更多
Zhou et al give an attack on Ham＇s modified authenticated multi-key agreement protocol, and give a protocol that can prevent the unknown key-share attack. The paper points out that the protocol is vulnerable to a con...Zhou et al give an attack on Ham＇s modified authenticated multi-key agreement protocol, and give a protocol that can prevent the unknown key-share attack. The paper points out that the protocol is vulnerable to a concatenation attack. This paper proposes an improved authenticated multi-key agreement protocol which shows how to make Harn＇s protocol more secure by modifying the signature and verification. And this protocol can escape the concatenation attack.展开更多
Negotiations for the Trans-Pacific Partnership （TPP） Agreement have concluded, but the TPP still must be ratified by each of the 12 member countries. China is the world＇s second largest economy and yet it has not j...Negotiations for the Trans-Pacific Partnership （TPP） Agreement have concluded, but the TPP still must be ratified by each of the 12 member countries. China is the world＇s second largest economy and yet it has not joined the TPP. This has provoked much debate in China as to the best strategic approach to the TPP This paper analyzes China＇s possible strategy for the TPP agreement. We make three key points. First, the security of market access should be China＇s main concern in any free-trade agreement negotiations, regrettably, it is not included in TPP. The second point is that the present TPP agreement is somewhat diminished from its ambitious original claims. We suggest four strategies for China. The first is to promote the development of China＇s remaining regional and bilateral free trade agreements （FTAs）. The second is to negotiate a bilateral FTA with the United States. The third is to promote deep domestic reforms via enlarged TPP coverage. The last is negotiating entrance to the entering do not worsen. TPP as soon as possible so that terms of展开更多
The differences among the extended Canetti ＆ Krawezyk 2007 model （ECK2007） and other four models, i.e., the Bellare ＆ Rogaway （1993, 1995）models （BR93,BR95）, the Bellare, Pointcheval ＆ Rogaway （2000） model ...The differences among the extended Canetti ＆ Krawezyk 2007 model （ECK2007） and other four models, i.e., the Bellare ＆ Rogaway （1993, 1995）models （BR93,BR95）, the Bellare, Pointcheval ＆ Rogaway （2000） model （BPR2000） and the Canetti ＆ Krawczyk （2001） model （CK2001） are given. The relative strength of security among these models is analyzed. To support the implication or non-implication relation among these models, the formal proof or the counter-example is provided.展开更多
As representatives of emerging economies,BRICS countries are increasingly prominent in global governance.The rapid economic development of BRICS countries is accompanied by a significant increase in greenhouse gas(GHG...As representatives of emerging economies,BRICS countries are increasingly prominent in global governance.The rapid economic development of BRICS countries is accompanied by a significant increase in greenhouse gas(GHG)emissions,and BRICS countries are paying increasing attention to climate change issues and actively participating in the construction of the international climate regime.The Paris Agreement was a historic breakthrough in international climate negotiations,and since then BRICS countries have strengthened multilateral and bilateral cooperation in energy efficiency,agricultural emission reduction and climate governance financing.Due to the constraints of technology,cooperation mechanism construction,financing,and other objective conditions,BRICS countries still face some challenges to further advance the global climate governance agenda with their group power in the short term.Whether BRICS countries can further advance the global climate governance agenda as a group in the post-Paris Agreement era depends on whether they can improve energy efficiency and optimize their energy mix,and whether they can deepen cooperation in agricultural emission reduction and climate finance.BRICS countries need to continue to promote clean energy development and low-carbon economic transformation,deepen the potential of climate cooperation in agricultural emission reduction,and give full play to the climate financing role of the New Development Bank,so as to further enhance the level of climate cooperation.At the same time,BRICS countries can widely involve developing countries in climate governance cooperation and strengthen dialogue and exchanges with other countries,so as to promote global climate governance in the post-Paris Agreement era.展开更多
At present,the biggest obstacle that growing enterprises may encounter in their development process is insufficient funds.Private equity financing does not only solve the capital problem of enterprises,but also provid...At present,the biggest obstacle that growing enterprises may encounter in their development process is insufficient funds.Private equity financing does not only solve the capital problem of enterprises,but also provide enterprises with professional management concepts and even help growing enterprises to go public in advance.However,high returns must be accompanied by high risks.For example,private equity financing has information asymmetry risks,principal-agent risks,etc.,and these risks make it impossible to maximize the advantages of private equity financing.Therefore,in order to reduce the risks brought by financing,investment and financing parties should choose to sign gambling contracts to reduce the risk.In recent years,the use of VAM agreements has become more in China.However,according to incomplete statistics,less than 30%of VAM agreements are successful,and this result is mainly due to the insufficient depth and breadth of research on VAM agreements.Therefore,this article will comprehensively analyze the problems that need to be paid attention to when signing a gambling agreement by introducing the case of Anda Technology,and the issue of targeted risk prevention will also be discussed in this paper.展开更多
In the area of secure Web information system, mutual authentication and key agreement are essential between Web clients and servers. An efficient certificateless authenticated key agreement protocol for Web client/ser...In the area of secure Web information system, mutual authentication and key agreement are essential between Web clients and servers. An efficient certificateless authenticated key agreement protocol for Web client/server setting is proposed, which uses pairings on certain elliptic curves. We show that the newly proposed key agreement protocol is practical and of great efficiency, meanwhile, it satisfies every desired security require ments for key agreement protocols.展开更多
Certificateless public key cryptography was introduced to overcome the key escrow limitation of the identity-based cryptography. It combines the advantages of the identity-based cryptography and the traditional PKI. M...Certificateless public key cryptography was introduced to overcome the key escrow limitation of the identity-based cryptography. It combines the advantages of the identity-based cryptography and the traditional PKI. Many certificateless public key encryption and signature schemes have been proposed. However, the key agreement in CL-PKE is seldom discussed. In this paper, we present a new certificateless two party authentication key agreement protocol and prove its security attributes. Compared with the existing protocol, our protocol is more efficient.展开更多
基金General Project of Beijing Social Science Foundation,“Research on the Internal and External Strategic Alignment of Regional Trade Agreements and the High-Quality Construction of China(Beijing)Pilot Free Trade Zone”(Project No.:21GLB021)。
文摘This paper analyzes the text of 3261 clauses of 20 RTAs signed by China,classifies them into 52 policy areas according to the international mainstream HMS method,and assigns them through coding.The clause depth of China’s RTAs is measured across three-dimensional systems(policy areas,clauses,and core clauses)and two generations of trade policy areas(WTO+,WTO-X,and all policy areas).It is observed that China’s RTAs exhibit greater depth in Industrial Products,Agricultural Products,TBT,Antidumping,Countervailing,and Investment,while showing comparatively less depth in Fiscal Policy,Innovation Policies,and related areas.
文摘Chile,a pioneer and benchmark partner for China's free trade.cooperation in Latin America,holds a special position in China-Latin America economic and trade relations.It was the first Latin American country to sign a bilateral free trade agreement with China and the first to reach an upgraded protocol.Chile also established mutual recognition of Authorized Economic Operators(AEO)with China,the first country in South America to do so.
基金supported in part by the Jiangsu“Qing Lan Project”,Natural Science Foundation of the Jiangsu Higher Education Institutions of China(Major Research Project:23KJA520007)Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.SJCX25_1303).
文摘As the adoption of Vehicular Ad-hoc Networks(VANETs)grows,ensuring secure communication between smart vehicles and remote application servers(APPs)has become a critical challenge.While existing solutions focus on various aspects of security,gaps remain in addressing both high security requirements and the resource-constrained nature of VANET environments.This paper proposes an extended-Kerberos protocol that integrates Physical Unclonable Function(PUF)for authentication and key agreement,offering a comprehensive solution to the security challenges in VANETs.The protocol facilitates mutual authentication and secure key agreement between vehicles and APPs,ensuring the confidentiality and integrity of vehicle-to-network(V2N)communications and preventing malicious data injection.Notably,by replacing traditional Kerberos password authentication with Challenge-Response Pairs(CRPs)generated by PUF,the protocol significantly reduces the risk of key leakage.The inherent properties of PUF—such as unclonability and unpredictability—make it an ideal defense against physical attacks,including intrusion,semi-intrusion,and side-channel attacks.The results of this study demonstrate that this approach not only enhances security but also optimizes communication efficiency,reduces latency,and improves overall user experience.The analysis proves that our protocol achieves at least 86%improvement in computational efficiency compared to some existed protocols.This is particularly crucial in resource-constrained VANET environments,where it enables efficient data transmission between vehicles and applications,reduces latency,and enhances the overall user experience.
基金supported by the Startup Foundation for Introducing Talent of Nanjing University of Information Science and Technology and Natural Science Foundation of Shandong Province,China(Grant no.ZR202111230202).
文摘With the rapid development and widespread adoption of Internet of Things(IoT)technology,the innovative concept of the Internet of Vehicles(IoV)has emerged,ushering in a new era of intelligent transportation.Since vehicles are mobile entities,they move across different domains and need to communicate with the Roadside Unit(RSU)in various regions.However,open environments are highly susceptible to becoming targets for attackers,posing significant risks of malicious attacks.Therefore,it is crucial to design a secure authentication protocol to ensure the security of communication between vehicles and RSUs,particularly in scenarios where vehicles cross domains.In this paper,we propose a provably secure cross-domain authentication and key agreement protocol for IoV.Our protocol comprises two authentication phases:intra-domain authentication and cross-domain authentication.To ensure the security of our protocol,we conducted rigorous analyses based on the ROR(Real-or-Random)model and Scyther.Finally,we show in-depth comparisons of our protocol with existing ones from both security and performance perspectives,fully demonstrating its security and efficiency.
文摘Unmanned Aerial Vehicles(UAVs)are increasingly recognized for their pivotal role in military and civilian applications,serving as essential technology for transmitting,evaluating,and gathering information.Unfortunately,this crucial process often occurs through unsecured wireless connections,exposing it to numerous cyber-physical attacks.Furthermore,UAVs’limited onboard computing resources make it challenging to perform complex cryptographic operations.The main aim of constructing a cryptographic scheme is to provide substantial security while reducing the computation and communication costs.This article introduces an efficient and secure cross-domain Authenticated Key Agreement(AKA)scheme that uses Hyperelliptic Curve Cryptography(HECC).The HECC,a modified version of ECC with a smaller key size of 80 bits,is well-suited for use in UAVs.In addition,the proposed scheme is employed in a cross-domain environment that integrates a Public Key Infrastructure(PKI)at the receiving end and a Certificateless Cryptosystem(CLC)at the sending end.Integrating CLC with PKI improves network security by restricting the exposure of encryption keys only to the message’s sender and subsequent receiver.A security study employing ROM and ROR models,together with a comparative performance analysis,shows that the proposed scheme outperforms comparable existing schemes in terms of both efficiency and security.
文摘Lignite provides energy security and contributes economically.However,it also causes dirty outcomes in terms of climate aspect.In addition to the energy and climate dimensions of the Sustainable Development Goals,there is also a water issue:lignite is usually found submerged below the local groundwater tables.Mining lignite could be exploited to achieve drinkable and agriculturally usable water.In today’s literature,while the impact of lignite production on global warming and emissions are already highly discussed,the water management side of the issue is regularly omitted.However,considering the complex interlink between these three areas(the Water-Energy-Climate(WEC)nexus)is necessary within policy coherence,which is mostly ignored even though it is one of the development targets.Here in this framework,Turkiye,which aims to reduce its heavy dependency on energy imports,is worth studying because almost all of its coal,the country’s largest fossil resource,is lignite.Therefore,this study examines the WEC nexus related to lignite production and combustion and seeks policy coherence between their outputs in the context of Turkiye’s historical steps to climate change mitigation,specifically oriented with the Paris Agreement.This story expands from the absence of specific development policy objectives to the practicalities of politics and economics.
基金supported in part by the National Natural Science Foundation of China under Grant 61941113,Grant 61971033,and Grant 61671057by the Henan Provincial Department of Science and Technology Project(No.212102210408)by the Henan Provincial Key Scientific Research Project(No.22A520041).
文摘5G technology has endowed mobile communication terminals with features such as ultrawideband access,low latency,and high reliability transmission,which can complete the network access and interconnection of a large number of devices,thus realizing richer application scenarios and constructing 5G-enabled vehicular networks.However,due to the vulnerability of wireless communication,vehicle privacy and communication security have become the key problems to be solved in vehicular networks.Moreover,the large-scale communication in the vehicular networks also makes the higher communication efficiency an inevitable requirement.In order to achieve efficient and secure communication while protecting vehicle privacy,this paper proposes a lightweight key agreement and key update scheme for 5G vehicular networks based on blockchain.Firstly,the key agreement is accomplished using certificateless public key cryptography,and based on the aggregate signature and the cooperation between the vehicle and the trusted authority,an efficient key updating method is proposed,which reduces the overhead and protects the privacy of the vehicle while ensuring the communication security.Secondly,by introducing blockchain and using smart contracts to load the vehicle public key table for key management,this meets the requirements of vehicle traceability and can dynamically track and revoke misbehaving vehicles.Finally,the formal security proof under the eck security model and the informal security analysis is conducted,it turns out that our scheme is more secure than other authentication schemes in the vehicular networks.Performance analysis shows that our scheme has lower overhead than existing schemes in terms of communication and computation.
基金Supported by the National Engineering Research Center of Classified Protection and Safeguard Technology for Cybersecurity(No.C23640-XD-07)the Open Foundation of Key Laboratory of Cyberspace Security of Ministry of Education of China and Henan Key Laboratory of Network Cryptography(No.KLCS20240301)。
文摘With the recent advances in quantum computing,the key agreement algorithm based on traditional cryptography theory,which is applied to the Internet of Things(IoT)scenario,will no longer be secure due to the possibility of information leakage.In this paper,we propose a anti-quantum dynamic authenticated group key agreement scheme(AQDA-GKA)according to the ring-learning with errors(RLWE)problem,which is suitable for IoT environments.First,the proposed AQDA-GKA scheme can implement a group key agreement against quantum computing attacks by leveraging an RLWE-based key agreement mechanism.Second,this scheme can achieve dynamic node management,ensuring that any node can freely join or exit the current group.Third,we formally prove that the proposed scheme can resist quantum computing attacks as well as collusion attacks.Finally,the performance and security analysis reveals that the proposed AQDA-GKA scheme is secure and effective.
基金This paper is a phased result of the“Research on the Issue of China’s Data Export System”(24SFB3035)a research project of the Ministry of Justice of China on the construction of the rule of law and the study of legal theories at the ministerial level in 2024.
文摘The Fourth Industrial Revolution has endowed the concept of state sovereignty with new era-specific connotations,leading to the emergence of the theory of data sovereignty.While countries refine their domestic legislation to establish their data sovereignty,they are also actively engaging in the negotiation of cross-border data flow rules within international trade agreements to construct data sovereignty.During these negotiations,countries express differing regulatory claims,with some focusing on safeguarding sovereignty and protecting human rights,some prioritizing economic promotion and security assurance,and others targeting traditional and innovative digital trade barriers.These varied approaches reflect the tension between three pairs of values:collectivism and individualism,freedom and security,and tradition and innovation.Based on their distinct value pursuits,three representative models of data sovereignty construction have emerged globally.At the current juncture,when international rules for digital trade are still in their nascent stages,China should timely establish its data sovereignty rules,actively participate in global data sovereignty competition,and balance its sovereignty interests with other interests.Specifically,China should explore the scope of system-acceptable digital trade barriers through free trade zones;integrate domestic and international legal frameworks to ensure the alignment of China’s data governance legislation with its obligations under international trade agreements;and use the development of the“Digital Silk Road”as a starting point to prioritize the formation of digital trade rules with countries participating in the Belt and Road Initiative,promoting the Chinese solutions internationally.
基金result of the“Research on ESG Supply Chain Governance and Labor Rights Protection”(Project Number SUFE-ESG-20250315)a general subject project of the Fullgoal Institute for ESG Research,SUFE in 2025.
文摘Labor provisions have become a fundamental trade rule in regional and bilateral trade agreements.Although China’s legislation on pilot Free Trade Zones includes content related to labor protection,it primarily aligns with labor indicators in“Doing Business”,the assessment of business situations issued by the World Bank.It differs from the labor rights protection focus emphasized in trade agreements.The latest strategic documents issued by the State Council of China have addressed this issue to fully achieve the goal of aligning Free Trade Zones with high-standard trade agreements.Building on the development of Free Trade Zone legislation and domestic labor law governance,China should proactively explore a tailored approach to labor provisions in Free Trade Agreements.In this approach,it should explicitly define the“baseline”and“ceiling”for labor provisions during negotiations and,within this framework,establish benchmarks for labor rights protection,enforcement mechanisms,and cross-border regulatory mechanisms suited to the specific conditions of the agreement parties.
基金funded by China Arctic and Antarctic Administration(Contract no.JDB2024060701014).
文摘On 19 June 2023,the Agreement under the United Nations Convention on the Law of the Sea on the Conservation and Sustainable Use of Marine Biological Diversity of Areas beyond National Jurisdiction(BBNJ Agreement)was adopted.The BBNJ Agreement aims to regulate the conservation and sustainable use of marine biodiversity in areas beyond national jurisdiction,including the high seas and the international seabed area.The BBNJ Agreement enters into an already crowded institutional landscape as a global authority with broad objectives,inevitably interacting with existing institutions,frameworks,and bodies(IFBs).Existing research has primarily focused on two areas:the first examines the impact of the institutions established by the BBNJ Agreement on existing marine governance IFBs;the second explores its influence on issues currently lacking institutional arrangements.However,comparatively little attention has been given to the Agreement’s potential impact on governance gaps within established systems.This paper takes the case of marine genetic resource(MGRs)management in the Antarctic Treaty Area to explore how the BBNJ Agreement may address regulatory gaps in a competent governance framework.Due to shortcomings in addressing core issues,concerning the legal status of MGRs access regulations,benefit-sharing mechanisms,and disclosure of origin,the Agreement is unlikely to have a significant impact on the governance of MGRs in the Antarctic Treaty System(ATS)in the short term.On the other hand,the ATS,as an effective governance framework for the Antarctic Treaty Area,has mature regulations and practical experience in Antarctic governance.Over the years,the ATS has focused on regulating bioprospecting activities as scientific research ones and strict environmental impact assessment procedures.However,there has not been an effective consensus on the regulation of commercial biological prospecting.This paper further explores the coordination issue between the BBNJ Agreement and the ATS,suggesting that in the future,MGRs governance in the Antarctic Treaty Area may evolve into a polycentric governance system.
基金supported by the National Basic Research Program of China (Grant Nos.2009CB723904 and 2012CB956202)the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA05090201)
文摘As more satellite-derived land cover products used in the study of global change, especially climate modeling, assessing their quality has become vitally important. In this study, we developed a distance metric based on the parameters used in weather research and forecasting （WRF） to characterize the degree of disagreement among land cover products and to identify the tolerance for misclassification within the International Geosphere Biosphere Programme （IGBP） classification scheme. We determined the spatial degree of disagreement and then created maps of misclassification of Moderate Resolution Imaging Spectoradiometer （MODIS） products, and we calculated overall and class-specific accuracy and fuzzy agreement in a WRF model. Our results show a high level of agreement and high tolerance of misclassification in the WRF model between large-scale homogeneous landscapes, while a low level of agreement and tolerance of misclassification appeared in heterogeneous landscapes. The degree of disagreement varied significantly among seven regions of China. The class-specific accuracy and fuzzy agreement in MODIS Collection 4 and 5 products varied significantly. High accuracy and fuzzy agreement occurred in the following classes： water, grassland, cropland, and barren or sparsely vegetated. Misclassification mainly occurred among specific classes with similar plant functional types and low discriminative spectro-temporal signals. Some classes need to be improved further; the quality of MODIS land cover products across China still does not meet the common requirements of climate modeling. Our findings may have important implications for improving land surface parameterization for simulating climate and for better understanding the influence of the land cover change on climate.
基金National Natural Science Foundation of China under Grant No. 60970116,60970115 and 90718006
文摘Group Key Agreement(GKA)is a cryptographic primitive allowing two or more entities to negotiate a shared session key over public networks.In existing GKA models,it is an open problem to construct a one-round multi-party GKA protocol.Wu et al.recently proposed the concept of asymmetric group key agreement(ASGKA)and realized a one-round ASGKA protocol,which affirmatively answers the above open problem in a relaxed way.However,the ASGKA protocol only applies to static groups.To fill this gap,this paper proposes an extended ASGKA protocol based on the Wu et al.protocol.The extension allows any member to join and leave at any point,provided that the resulting group size is not greater than n.To validate the proposal,extensive experiments are performed and the experimental results show that our protocol is more effective than a plain realization of the Wu et al.protocol for dynamic groups.The extended protocol is also more efficient than the up-to-date dynamic GKA protocol in terms of communication and computation.
基金Supported by the National Natural Science Foun-dation of China(60373059) the National Research Foundationfor theDoctoral Programof Higher Education of China(20040013007) the Major Research Plan of the National Natural Science Foundation ofChina(90604023)
文摘Zhou et al give an attack on Ham＇s modified authenticated multi-key agreement protocol, and give a protocol that can prevent the unknown key-share attack. The paper points out that the protocol is vulnerable to a concatenation attack. This paper proposes an improved authenticated multi-key agreement protocol which shows how to make Harn＇s protocol more secure by modifying the signature and verification. And this protocol can escape the concatenation attack.
文摘Negotiations for the Trans-Pacific Partnership （TPP） Agreement have concluded, but the TPP still must be ratified by each of the 12 member countries. China is the world＇s second largest economy and yet it has not joined the TPP. This has provoked much debate in China as to the best strategic approach to the TPP This paper analyzes China＇s possible strategy for the TPP agreement. We make three key points. First, the security of market access should be China＇s main concern in any free-trade agreement negotiations, regrettably, it is not included in TPP. The second point is that the present TPP agreement is somewhat diminished from its ambitious original claims. We suggest four strategies for China. The first is to promote the development of China＇s remaining regional and bilateral free trade agreements （FTAs）. The second is to negotiate a bilateral FTA with the United States. The third is to promote deep domestic reforms via enlarged TPP coverage. The last is negotiating entrance to the entering do not worsen. TPP as soon as possible so that terms of
文摘The differences among the extended Canetti ＆ Krawezyk 2007 model （ECK2007） and other four models, i.e., the Bellare ＆ Rogaway （1993, 1995）models （BR93,BR95）, the Bellare, Pointcheval ＆ Rogaway （2000） model （BPR2000） and the Canetti ＆ Krawczyk （2001） model （CK2001） are given. The relative strength of security among these models is analyzed. To support the implication or non-implication relation among these models, the formal proof or the counter-example is provided.
文摘As representatives of emerging economies,BRICS countries are increasingly prominent in global governance.The rapid economic development of BRICS countries is accompanied by a significant increase in greenhouse gas(GHG)emissions,and BRICS countries are paying increasing attention to climate change issues and actively participating in the construction of the international climate regime.The Paris Agreement was a historic breakthrough in international climate negotiations,and since then BRICS countries have strengthened multilateral and bilateral cooperation in energy efficiency,agricultural emission reduction and climate governance financing.Due to the constraints of technology,cooperation mechanism construction,financing,and other objective conditions,BRICS countries still face some challenges to further advance the global climate governance agenda with their group power in the short term.Whether BRICS countries can further advance the global climate governance agenda as a group in the post-Paris Agreement era depends on whether they can improve energy efficiency and optimize their energy mix,and whether they can deepen cooperation in agricultural emission reduction and climate finance.BRICS countries need to continue to promote clean energy development and low-carbon economic transformation,deepen the potential of climate cooperation in agricultural emission reduction,and give full play to the climate financing role of the New Development Bank,so as to further enhance the level of climate cooperation.At the same time,BRICS countries can widely involve developing countries in climate governance cooperation and strengthen dialogue and exchanges with other countries,so as to promote global climate governance in the post-Paris Agreement era.
文摘At present,the biggest obstacle that growing enterprises may encounter in their development process is insufficient funds.Private equity financing does not only solve the capital problem of enterprises,but also provide enterprises with professional management concepts and even help growing enterprises to go public in advance.However,high returns must be accompanied by high risks.For example,private equity financing has information asymmetry risks,principal-agent risks,etc.,and these risks make it impossible to maximize the advantages of private equity financing.Therefore,in order to reduce the risks brought by financing,investment and financing parties should choose to sign gambling contracts to reduce the risk.In recent years,the use of VAM agreements has become more in China.However,according to incomplete statistics,less than 30%of VAM agreements are successful,and this result is mainly due to the insufficient depth and breadth of research on VAM agreements.Therefore,this article will comprehensively analyze the problems that need to be paid attention to when signing a gambling agreement by introducing the case of Anda Technology,and the issue of targeted risk prevention will also be discussed in this paper.
基金Supported bythe National Natural Science Foundationof China (60225007 ,60572155) the Science and Technology ResearchProject of Shanghai (04DZ07067)
文摘In the area of secure Web information system, mutual authentication and key agreement are essential between Web clients and servers. An efficient certificateless authenticated key agreement protocol for Web client/server setting is proposed, which uses pairings on certain elliptic curves. We show that the newly proposed key agreement protocol is practical and of great efficiency, meanwhile, it satisfies every desired security require ments for key agreement protocols.
基金Supported by the National Natural Science Foundation of China (19501032)
文摘Certificateless public key cryptography was introduced to overcome the key escrow limitation of the identity-based cryptography. It combines the advantages of the identity-based cryptography and the traditional PKI. Many certificateless public key encryption and signature schemes have been proposed. However, the key agreement in CL-PKE is seldom discussed. In this paper, we present a new certificateless two party authentication key agreement protocol and prove its security attributes. Compared with the existing protocol, our protocol is more efficient.
