Group communication is widely used by most of the emerging network applications like telecommunication,video conferencing,simulation applications,distributed and other interactive systems.Secured group communication p...Group communication is widely used by most of the emerging network applications like telecommunication,video conferencing,simulation applications,distributed and other interactive systems.Secured group communication plays a vital role in case of providing the integrity,authenticity,confidentiality,and availability of the message delivered among the group members with respect to communicate securely between the inter group or else within the group.In secure group communications,the time cost associated with the key updating in the proceedings of the member join and departure is an important aspect of the quality of service,particularly in the large groups with highly active membership.Hence,the paper is aimed to achieve better cost and time efficiency through an improved DC multicast routing protocol which is used to expose the path between the nodes participating in the group communication.During this process,each node constructs an adaptive Ptolemy decision tree for the purpose of generating the contributory key.Each of the node is comprised of three keys which will be exchanged between the nodes for considering the group key for the purpose of secure and cost-efficient group communication.The rekeying process is performed when a member leaves or adds into the group.The performance metrics of novel approach is measured depending on the important factors such as computational and communicational cost,rekeying process and formation of the group.It is concluded from the study that the technique has reduced the computational and communicational cost of the secure group communication when compared to the other existing methods.展开更多
In a secure group communication system, messages must be encrypted before being transmitted to group members to prevent unauthorized access. In many secure group communication schemes, whenever a member leaves or join...In a secure group communication system, messages must be encrypted before being transmitted to group members to prevent unauthorized access. In many secure group communication schemes, whenever a member leaves or joins the group, group center (GC) immediately changes the common encryption key and sends the new key to all valid members for forward and backward secrecy. If valid members are not on-line, they will miss the re-keying messages and will not be able to decrypt any ciphertext. Therefore, group members must be able to store the state of the system. In some applications, like global positioning systems (GPS) or pay-per-view systems, it is not reasonable to ask group members to stay on-line all the time and save the changes to the system. A hierarchical binary tree-based key management scheme are proposed for a secure group communication. This scheme reduces the key storage requirement of GC to a constant size and the group members are not required to be on-line constantly (stateless).展开更多
An overlay share mesh infrastructure is presented for high dynamic group communication systems, such as distributed interactive simulation (DIS) and distributed virtual environments (DVE). Overlay share mesh infrastru...An overlay share mesh infrastructure is presented for high dynamic group communication systems, such as distributed interactive simulation (DIS) and distributed virtual environments (DVE). Overlay share mesh infrastructure can own better adapting ability for high dynamic group than tradition multi-tree multicast infrastructure by sharing links among different groups. The mechanism of overlay share mesh based on area of interest (AOI) was discussed in detail in this paper. A large number of simulation experiments were done and the performance of mesh infrastructure was studied. Experiments results proved that overlay mesh infrastructure owns better adaptability than traditional multi-tree infrastructure for high dynamic group communication systems.展开更多
As the major problem in multicast security, the group key management has been the focus of research But few results are satisfactory. In this paper, the problems of group key management and access control for large dy...As the major problem in multicast security, the group key management has been the focus of research But few results are satisfactory. In this paper, the problems of group key management and access control for large dynamic multicast group have been researched and a solution based on SubGroup Secure Controllers (SGSCs) is presented, which solves many problems in IOLUS system and WGL scheme.展开更多
Network security protocols such as IPsec have been used for many years to ensure robust end-to-end communication and are important in the context of SDN. Despite the widespread installation of IPsec to date, per-packe...Network security protocols such as IPsec have been used for many years to ensure robust end-to-end communication and are important in the context of SDN. Despite the widespread installation of IPsec to date, per-packet protection offered by the protocol is not very compatible with OpenFlow and tlow-like behavior. OpenFlow architecture cannot aggregate IPsee-ESP flows in transport mode or tunnel mode because layer-3 information is encrypted and therefore unreadable. In this paper, we propose using the Security Parameter Index （SPI） of IPsec within the OpenFlow architecture to identify and direct IPsec flows. This enables IPsec to conform to the packet-based behavior of OpenFlow architecture. In addition, by distinguishing between IPsec flows, the architecture is particularly suited to secure group communication.展开更多
Group communication services （GCSs） are becoming increasingly important as a wide field of promising applications has emerged to serve millions of users distributed across the world.However,it is challenging to make...Group communication services （GCSs） are becoming increasingly important as a wide field of promising applications has emerged to serve millions of users distributed across the world.However,it is challenging to make the service fault tolerance and scalable to fulfill the voluminous demand of users in a distributed network （DN）.While many reliable group communication protocols have been dedicated to addressing such a challenge so as to accommodate the changes in the network,they are often costly or require complicated strategies to handle the service interruptions caused by node departures or link failures,which hinders the service practicability.In this paper,we present two schemes to address the challenges.The first one is a location-aware replication scheme called NS,which makes replicas in a dispersed fashion that enables the services on nodes to gain immunity of failures with different patterns （e.g.,network partition and single point failure） while keeping replication overhead low.The second one is a novel failure recovery scheme that exploits the independence between service recovery and structure recovery in time domain to achieve quick failure recovery.Our simulation results indicate that the two proposed schemes outperform the existing schemes and simple alternative schemes in service success rate,recovery latency,and communication cost.展开更多
By introducing XOR operation and one-way function chains to group key management schemes based on the keys tree, a new group key management scheme based on the keys tree, XOR operation and one-way function chains is p...By introducing XOR operation and one-way function chains to group key management schemes based on the keys tree, a new group key management scheme based on the keys tree, XOR operation and one-way function chains is proposed. Initialization, member adding and member evicting operations are introduced. The new scheme is compared with three other group key management schemes which are based on the keys tree： SKDC, LKH, and OFF. As far as transmission, computation and storage costs are concerned, the performance of the new group key management scheme is the best. The security problem of the new scheme is analyzed. This new scheme provides backward and forward security, i.e.. newly admitted group members cannot read previous multicast messages and evicted members cannot read future multicast messages, even with collusion by many arbitrarily evicted members.展开更多
Time efficiency of key establishment and update is one of the major problems contributory key managements strive to address.To achieve better time efficiency in key establishment,we propose a Location-based Huffman(L-...Time efficiency of key establishment and update is one of the major problems contributory key managements strive to address.To achieve better time efficiency in key establishment,we propose a Location-based Huffman(L-Huffman) scheme.First,users are separated into several small groups to minimize communication cost when they are distributed over large networks.Second,both user's computation difference and message transmission delay are taken into consideration when Huffman coding is employed to forming the optimal key tree.Third,the combined weights in Huffman tree are located in a higher place of the key tree to reduce the variance of the average key generation time and minimize the longest key generation time.Simulations demonstrate that L-Huffman has much better performance in wide area networks and is a little better in local area network than Huffman scheme.展开更多
The international reference ionosphere （IRI） model is generally accepted standard ionosphere model. It describes the ionosphere environment in quiet state and predicts the ionosphere parameters within a certain prec...The international reference ionosphere （IRI） model is generally accepted standard ionosphere model. It describes the ionosphere environment in quiet state and predicts the ionosphere parameters within a certain precision. In this paper, we have made a breakthrough in the application of the IRI model by modifying the model for regions of China. The main objectives of this modification are to construct the ionosphere parameters foF2 and M （3000） F2 by using the Chinese reference ionosphere （CRI） coefficients, appropriately increase hmE and hmF2 height, reduce the thickness of F layer, validate the parameter by the measured values, and solve the electron concentration distribution with quasi-parabolic segment （QPS）. In this paper, 3D ray tracing algorithm is constructed based on the modified IRI model and international geomagnetic reference field （IGRF） model. In short-wave propagation, it can be used to predict the electromagnetic parameters of the receiving point, such as the receiving area, maximum useable frequency （MUF） and the distribution of the group delay etc., which can help to determine the suitability of the communication. As an example, we estimate the group delay distributions around Changchun in the detection from Qingdao to Changchun using the modified IRI model and IGRF model, and provide technical support for the short-wave communication between the two cities.展开更多
Group multicast routing algorithms satisfying quality of service requirements of real-time applications are essential for high-speed networks. A heuristic algorithm was presented for group multicast routing with bandw...Group multicast routing algorithms satisfying quality of service requirements of real-time applications are essential for high-speed networks. A heuristic algorithm was presented for group multicast routing with bandwidth and delay constrained. A new metric was designed as a function of available bandwidth and delay of link. And source-specific routing trees for each member were generated in the algorithm by using the metric, which satisfy member′s bandwidth and end-to-end delay requirements. Simulations over random network were carried out to compare the performance of the proposed algorithm with that from literature.Experimental results show that the algorithm performs better in terms of network cost and ability in constructing feasible multicast trees for group members. Moreover,the algorithm can avoid link blocking and enhance the network behavior efficiently.展开更多
On February 27,the release ceremony of the Top 10 News Stories on 2024 China-Asean Cooperation took place in Nanning,capital of Guangxi Zhuang Autonomous Region.The event was organized under the guidance of the China ...On February 27,the release ceremony of the Top 10 News Stories on 2024 China-Asean Cooperation took place in Nanning,capital of Guangxi Zhuang Autonomous Region.The event was organized under the guidance of the China International Communications Group(CICG),China Foreign Affairs University(CFAU),and the Publicity Department of the Party Committee of Guangxi Zhuang Autonomous Region.It was jointly hosted by CICG Asia-Pacific,the Institute of Asian Studies of CFAU,and Guangxi University.展开更多
On October 21,2025,the ASEAN-China(Beijing Municipal Administrative Center)Trade and Investment Promotion Conference took place at the Beijing International Fortune Center.Under the theme“Joining Hands for Green Deve...On October 21,2025,the ASEAN-China(Beijing Municipal Administrative Center)Trade and Investment Promotion Conference took place at the Beijing International Fortune Center.Under the theme“Joining Hands for Green Development and a Better Future,”the conference was supervised by China International Communications Group(CICG)and co-hosted by ASEAN-China Centre(ACC),Beijing Municipal Administrative Center Management Committee,Beijing Tongzhou District People’s Government,and CICG Asia-Pacific.展开更多
As mobile internet and Internet of Things technologies continue to advance,the application scenarios of peer-to-peer Internet of Drones(IoD)are becoming increasingly diverse.However,the development of IoD also faces s...As mobile internet and Internet of Things technologies continue to advance,the application scenarios of peer-to-peer Internet of Drones(IoD)are becoming increasingly diverse.However,the development of IoD also faces signifcant challenges,such as security,privacy protection,and limited computing power,which require technological innova-tion to overcome.For group secure communication,it is necessary to provide two basic services,user authentication and group key agreement.Due to the limited storage of IoD devices,group key negotiation requires lightweight calculations,and conventional schemes cannot satisfy the requirements of group communication in the IoD.To this end,a new lightweight communication scheme based on ring neighbors is presented in this paper for IoD,which not only realizes the identity verifcation of user and group key negotiation,but also improves computational ef-ciency on each group member side.A detailed security analysis substantiates that the designed scheme is capable of withstanding attacks from both internal and external adversaries while satisfying all defned security requirements.More importantly,in our proposal,the computational cost on the user side remains unafected by the variability of the number of members participating in group communication,as members communicate in a non-interactive manner through broadcasting.As a result,the protocol proposed in this article demonstrates lower computational and communication costs in comparison to other cryptographic schemes.Hence,this proposal presents a more appealing approach to lightweight group key agreement protocol with user authentication for application in the IoD.展开更多
Communicative language teaching is generally accepted in the field of second language teaching. In this paper, the author introduces a model of communicative language teaching. The authors also mention some practical ...Communicative language teaching is generally accepted in the field of second language teaching. In this paper, the author introduces a model of communicative language teaching. The authors also mention some practical requirements and methods in the application of this model, such as authentic materials and group work.展开更多
Public communication infrastructures are susceptible to disasters. Thus, the Emergency Communication Networks(ECNs) of small groups are necessary to maintain real-time communication during disasters. Given that ECNs a...Public communication infrastructures are susceptible to disasters. Thus, the Emergency Communication Networks(ECNs) of small groups are necessary to maintain real-time communication during disasters. Given that ECNs are self-built by users, the unavailability of infrastructures and the openness of wireless channels render them insecure. ECN security, however, is a rarely studied issue despite of its importance. Here, we propose a security scheme for the ECNs of small groups. Our scheme is based on the optimized Byzantine Generals’ Problem combined with the analysis of trusted security problems in ECNs. Applying the Byzantine Generals’ Problem to ECNs is a novel approach to realize two new functions, debugging and error correction, for ensuring system consistency and accuracy. Given the limitation of terminal devices, the lightweight fast ECDSA algorithm is introduced to guarantee the integrity and security of communication and the efficiency of the network. We implement a simulation to verify the feasibility of the algorithm after theoretical optimization.展开更多
One crucial measure of strengthening and advancing the Party's work on ethnic affairs in the new era is to promote interaction,communication and integration of various ethnic groups,so as to enhance commonality.En...One crucial measure of strengthening and advancing the Party's work on ethnic affairs in the new era is to promote interaction,communication and integration of various ethnic groups,so as to enhance commonality.Entering the new era,Inner Mongolia,Guangxi and Ningxia have achieved remarkable results in encouraging interaction,communication and integration of various ethnic groups.By comparatively analyzing successes of the three autonomous regions through the perspective of promoting commonality,this article summarizes the following strategic revelations:1)we should comprehensively implement the Party's ethnic policies and ensure theactual implementation of mutual interaction,mutual communication and mutual integration of ethnic groups;2)we should proactively promote the substantial progress of the economy,so as to provide solid material foundation for mutual interaction,mutual communication and mutual integration of ethnic groups;3)we should facilitate activities that promote ethnic unity and progress,so that the promotion of interaction,communication and mutual integration of ethnic groups can be seen,be felt and gain actual outcomes;4)we should take measures that suit to local conditions and explore all-round embedding mechanisms in order to foster the ethos for mutual interaction,mutual communication and mutual integration of ethnic groups;5)we should make every effort to forge a strong sense of community for the Chinese nation and orient precisely to the cause of encouraging mutual interaction,mutual communication and mutual integration of ethnic groups.展开更多
Editor's Note:From November 30 to December 7,several China International Communications Group media outlets,including Beijing Review,China Today,China.org.cn,China Report ASEAN and China Pictorial,visited multiple...Editor's Note:From November 30 to December 7,several China International Communications Group media outlets,including Beijing Review,China Today,China.org.cn,China Report ASEAN and China Pictorial,visited multiple villages and towns in Huzhou,Jiaxing and Ningbo cities in Zhejiang Province to explore the transformation currently underway in China's rural areas.展开更多
As part of continued efforts to increase cultural understanding between China and other countries,four international experts embarked on an exploration of Chongqing Municipality and Sichuan Province from May 24 to 27....As part of continued efforts to increase cultural understanding between China and other countries,four international experts embarked on an exploration of Chongqing Municipality and Sichuan Province from May 24 to 27.Dubbed the"Understanding China"tour,the program was organized by China International Communications Group(CICG)for the judges of the second Orchid Awards,whose shortlist of 30 nominees was announced on May 22.展开更多
On the afternoon of September 29,2025,as part of the Beijing-Tianjin-Hebei Outstanding Popular Science Book Catalog Release and Popular Science Creation&Publishing Exchange Conference,the launch event for the Engl...On the afternoon of September 29,2025,as part of the Beijing-Tianjin-Hebei Outstanding Popular Science Book Catalog Release and Popular Science Creation&Publishing Exchange Conference,the launch event for the English edition of Hi,I'm China was held at the Beijing Library.Xie Gang,vice president of China International Communications Group,and Nie Zhenning,head of the national reading committee at the Publishers Association of China,attended the event and officially unveiled the new book.Representatives of readers from multiple countries,along with experts and scholars from various fields,were invited to participate.展开更多
Web of Things （WoT） makes it possible to connect tremendous embedded devices to web in Representational State Transfer （REST） style. Some lightweight RESTful protocols have been proposed for the WoT to replace the...Web of Things （WoT） makes it possible to connect tremendous embedded devices to web in Representational State Transfer （REST） style. Some lightweight RESTful protocols have been proposed for the WoT to replace the HTTP protocol running on embedded devices. However, they keep the principal characteristic of the REST style. In particular, they support one-to-one requests in the client-server mode by four standard RESTful methods （GET, PUT, POST, and DELETE）. This characteristic is however inconsistent with the practical networks of embedded devices, which typically perform a group operation. In order to meet the requirement of group communication in the WoT, we propose a resource-oriented protocol called SeaHttp to extend the REST style by introducing two new methods, namely BRANCH and COMBINE respectively. SeaHttp supports parallel processing of group requests by means of splitting and merging them. In addition SeaHttp adds spatiotemporal attributes to the standard URI for naming a dynamic request group of physical resource. Experimental results show that SeaHttp can reduce average energy consumption of group communication in the WoT by 18.5%, compared with the Constrained Application Protocol （CoAP）.展开更多
文摘Group communication is widely used by most of the emerging network applications like telecommunication,video conferencing,simulation applications,distributed and other interactive systems.Secured group communication plays a vital role in case of providing the integrity,authenticity,confidentiality,and availability of the message delivered among the group members with respect to communicate securely between the inter group or else within the group.In secure group communications,the time cost associated with the key updating in the proceedings of the member join and departure is an important aspect of the quality of service,particularly in the large groups with highly active membership.Hence,the paper is aimed to achieve better cost and time efficiency through an improved DC multicast routing protocol which is used to expose the path between the nodes participating in the group communication.During this process,each node constructs an adaptive Ptolemy decision tree for the purpose of generating the contributory key.Each of the node is comprised of three keys which will be exchanged between the nodes for considering the group key for the purpose of secure and cost-efficient group communication.The rekeying process is performed when a member leaves or adds into the group.The performance metrics of novel approach is measured depending on the important factors such as computational and communicational cost,rekeying process and formation of the group.It is concluded from the study that the technique has reduced the computational and communicational cost of the secure group communication when compared to the other existing methods.
文摘In a secure group communication system, messages must be encrypted before being transmitted to group members to prevent unauthorized access. In many secure group communication schemes, whenever a member leaves or joins the group, group center (GC) immediately changes the common encryption key and sends the new key to all valid members for forward and backward secrecy. If valid members are not on-line, they will miss the re-keying messages and will not be able to decrypt any ciphertext. Therefore, group members must be able to store the state of the system. In some applications, like global positioning systems (GPS) or pay-per-view systems, it is not reasonable to ask group members to stay on-line all the time and save the changes to the system. A hierarchical binary tree-based key management scheme are proposed for a secure group communication. This scheme reduces the key storage requirement of GC to a constant size and the group members are not required to be on-line constantly (stateless).
基金The National Basic Research Program of China(973Program)(No.2002CB312200)The National Natural Science Foundation of China(No.60575036)
文摘An overlay share mesh infrastructure is presented for high dynamic group communication systems, such as distributed interactive simulation (DIS) and distributed virtual environments (DVE). Overlay share mesh infrastructure can own better adapting ability for high dynamic group than tradition multi-tree multicast infrastructure by sharing links among different groups. The mechanism of overlay share mesh based on area of interest (AOI) was discussed in detail in this paper. A large number of simulation experiments were done and the performance of mesh infrastructure was studied. Experiments results proved that overlay mesh infrastructure owns better adaptability than traditional multi-tree infrastructure for high dynamic group communication systems.
文摘As the major problem in multicast security, the group key management has been the focus of research But few results are satisfactory. In this paper, the problems of group key management and access control for large dynamic multicast group have been researched and a solution based on SubGroup Secure Controllers (SGSCs) is presented, which solves many problems in IOLUS system and WGL scheme.
文摘Network security protocols such as IPsec have been used for many years to ensure robust end-to-end communication and are important in the context of SDN. Despite the widespread installation of IPsec to date, per-packet protection offered by the protocol is not very compatible with OpenFlow and tlow-like behavior. OpenFlow architecture cannot aggregate IPsee-ESP flows in transport mode or tunnel mode because layer-3 information is encrypted and therefore unreadable. In this paper, we propose using the Security Parameter Index （SPI） of IPsec within the OpenFlow architecture to identify and direct IPsec flows. This enables IPsec to conform to the packet-based behavior of OpenFlow architecture. In addition, by distinguishing between IPsec flows, the architecture is particularly suited to secure group communication.
基金supported by National Science Foundation (NSF) grant from CISE NetSE Program and CyberTrust Cross-Cutting Program of USA,IBM faculty awardIBM SUR grant,grant from Intel Research Council+4 种基金the National Basic Research 973 Program of China under Grant No. 2009CB320805the National Natural Science Foundation of China under Grant No. 61170188the National High Technology Research and Development 863 Program of China under Grant No. 2012AA011803Fundamental Research Funds for the Central Universities of Chinasupported by China Scholarship Council (CSC)
文摘Group communication services （GCSs） are becoming increasingly important as a wide field of promising applications has emerged to serve millions of users distributed across the world.However,it is challenging to make the service fault tolerance and scalable to fulfill the voluminous demand of users in a distributed network （DN）.While many reliable group communication protocols have been dedicated to addressing such a challenge so as to accommodate the changes in the network,they are often costly or require complicated strategies to handle the service interruptions caused by node departures or link failures,which hinders the service practicability.In this paper,we present two schemes to address the challenges.The first one is a location-aware replication scheme called NS,which makes replicas in a dispersed fashion that enables the services on nodes to gain immunity of failures with different patterns （e.g.,network partition and single point failure） while keeping replication overhead low.The second one is a novel failure recovery scheme that exploits the independence between service recovery and structure recovery in time domain to achieve quick failure recovery.Our simulation results indicate that the two proposed schemes outperform the existing schemes and simple alternative schemes in service success rate,recovery latency,and communication cost.
文摘By introducing XOR operation and one-way function chains to group key management schemes based on the keys tree, a new group key management scheme based on the keys tree, XOR operation and one-way function chains is proposed. Initialization, member adding and member evicting operations are introduced. The new scheme is compared with three other group key management schemes which are based on the keys tree： SKDC, LKH, and OFF. As far as transmission, computation and storage costs are concerned, the performance of the new group key management scheme is the best. The security problem of the new scheme is analyzed. This new scheme provides backward and forward security, i.e.. newly admitted group members cannot read previous multicast messages and evicted members cannot read future multicast messages, even with collusion by many arbitrarily evicted members.
基金Supported by National Basic Research and Development Program of China (2007CB307102)
文摘Time efficiency of key establishment and update is one of the major problems contributory key managements strive to address.To achieve better time efficiency in key establishment,we propose a Location-based Huffman(L-Huffman) scheme.First,users are separated into several small groups to minimize communication cost when they are distributed over large networks.Second,both user's computation difference and message transmission delay are taken into consideration when Huffman coding is employed to forming the optimal key tree.Third,the combined weights in Huffman tree are located in a higher place of the key tree to reduce the variance of the average key generation time and minimize the longest key generation time.Simulations demonstrate that L-Huffman has much better performance in wide area networks and is a little better in local area network than Huffman scheme.
文摘The international reference ionosphere （IRI） model is generally accepted standard ionosphere model. It describes the ionosphere environment in quiet state and predicts the ionosphere parameters within a certain precision. In this paper, we have made a breakthrough in the application of the IRI model by modifying the model for regions of China. The main objectives of this modification are to construct the ionosphere parameters foF2 and M （3000） F2 by using the Chinese reference ionosphere （CRI） coefficients, appropriately increase hmE and hmF2 height, reduce the thickness of F layer, validate the parameter by the measured values, and solve the electron concentration distribution with quasi-parabolic segment （QPS）. In this paper, 3D ray tracing algorithm is constructed based on the modified IRI model and international geomagnetic reference field （IGRF） model. In short-wave propagation, it can be used to predict the electromagnetic parameters of the receiving point, such as the receiving area, maximum useable frequency （MUF） and the distribution of the group delay etc., which can help to determine the suitability of the communication. As an example, we estimate the group delay distributions around Changchun in the detection from Qingdao to Changchun using the modified IRI model and IGRF model, and provide technical support for the short-wave communication between the two cities.
基金Supported by China Postdoctoral Science Foundation (No.20030056007).
文摘Group multicast routing algorithms satisfying quality of service requirements of real-time applications are essential for high-speed networks. A heuristic algorithm was presented for group multicast routing with bandwidth and delay constrained. A new metric was designed as a function of available bandwidth and delay of link. And source-specific routing trees for each member were generated in the algorithm by using the metric, which satisfy member′s bandwidth and end-to-end delay requirements. Simulations over random network were carried out to compare the performance of the proposed algorithm with that from literature.Experimental results show that the algorithm performs better in terms of network cost and ability in constructing feasible multicast trees for group members. Moreover,the algorithm can avoid link blocking and enhance the network behavior efficiently.
文摘On February 27,the release ceremony of the Top 10 News Stories on 2024 China-Asean Cooperation took place in Nanning,capital of Guangxi Zhuang Autonomous Region.The event was organized under the guidance of the China International Communications Group(CICG),China Foreign Affairs University(CFAU),and the Publicity Department of the Party Committee of Guangxi Zhuang Autonomous Region.It was jointly hosted by CICG Asia-Pacific,the Institute of Asian Studies of CFAU,and Guangxi University.
文摘On October 21,2025,the ASEAN-China(Beijing Municipal Administrative Center)Trade and Investment Promotion Conference took place at the Beijing International Fortune Center.Under the theme“Joining Hands for Green Development and a Better Future,”the conference was supervised by China International Communications Group(CICG)and co-hosted by ASEAN-China Centre(ACC),Beijing Municipal Administrative Center Management Committee,Beijing Tongzhou District People’s Government,and CICG Asia-Pacific.
基金supported by the National Natural Science Founda-tion of China(Grants Nos.62172181,62272189,62072133)the Fundamental Research Funds for the Central Universities(No.CCNU19TS019)+1 种基金the Research Planning Project of National Language Committee(No.YB135-40)the Research Initiation Project of Zhejiang Lab(No.2022PD0AC02).
文摘As mobile internet and Internet of Things technologies continue to advance,the application scenarios of peer-to-peer Internet of Drones(IoD)are becoming increasingly diverse.However,the development of IoD also faces signifcant challenges,such as security,privacy protection,and limited computing power,which require technological innova-tion to overcome.For group secure communication,it is necessary to provide two basic services,user authentication and group key agreement.Due to the limited storage of IoD devices,group key negotiation requires lightweight calculations,and conventional schemes cannot satisfy the requirements of group communication in the IoD.To this end,a new lightweight communication scheme based on ring neighbors is presented in this paper for IoD,which not only realizes the identity verifcation of user and group key negotiation,but also improves computational ef-ciency on each group member side.A detailed security analysis substantiates that the designed scheme is capable of withstanding attacks from both internal and external adversaries while satisfying all defned security requirements.More importantly,in our proposal,the computational cost on the user side remains unafected by the variability of the number of members participating in group communication,as members communicate in a non-interactive manner through broadcasting.As a result,the protocol proposed in this article demonstrates lower computational and communication costs in comparison to other cryptographic schemes.Hence,this proposal presents a more appealing approach to lightweight group key agreement protocol with user authentication for application in the IoD.
文摘Communicative language teaching is generally accepted in the field of second language teaching. In this paper, the author introduces a model of communicative language teaching. The authors also mention some practical requirements and methods in the application of this model, such as authentic materials and group work.
文摘Public communication infrastructures are susceptible to disasters. Thus, the Emergency Communication Networks(ECNs) of small groups are necessary to maintain real-time communication during disasters. Given that ECNs are self-built by users, the unavailability of infrastructures and the openness of wireless channels render them insecure. ECN security, however, is a rarely studied issue despite of its importance. Here, we propose a security scheme for the ECNs of small groups. Our scheme is based on the optimized Byzantine Generals’ Problem combined with the analysis of trusted security problems in ECNs. Applying the Byzantine Generals’ Problem to ECNs is a novel approach to realize two new functions, debugging and error correction, for ensuring system consistency and accuracy. Given the limitation of terminal devices, the lightweight fast ECDSA algorithm is introduced to guarantee the integrity and security of communication and the efficiency of the network. We implement a simulation to verify the feasibility of the algorithm after theoretical optimization.
文摘One crucial measure of strengthening and advancing the Party's work on ethnic affairs in the new era is to promote interaction,communication and integration of various ethnic groups,so as to enhance commonality.Entering the new era,Inner Mongolia,Guangxi and Ningxia have achieved remarkable results in encouraging interaction,communication and integration of various ethnic groups.By comparatively analyzing successes of the three autonomous regions through the perspective of promoting commonality,this article summarizes the following strategic revelations:1)we should comprehensively implement the Party's ethnic policies and ensure theactual implementation of mutual interaction,mutual communication and mutual integration of ethnic groups;2)we should proactively promote the substantial progress of the economy,so as to provide solid material foundation for mutual interaction,mutual communication and mutual integration of ethnic groups;3)we should facilitate activities that promote ethnic unity and progress,so that the promotion of interaction,communication and mutual integration of ethnic groups can be seen,be felt and gain actual outcomes;4)we should take measures that suit to local conditions and explore all-round embedding mechanisms in order to foster the ethos for mutual interaction,mutual communication and mutual integration of ethnic groups;5)we should make every effort to forge a strong sense of community for the Chinese nation and orient precisely to the cause of encouraging mutual interaction,mutual communication and mutual integration of ethnic groups.
文摘Editor's Note:From November 30 to December 7,several China International Communications Group media outlets,including Beijing Review,China Today,China.org.cn,China Report ASEAN and China Pictorial,visited multiple villages and towns in Huzhou,Jiaxing and Ningbo cities in Zhejiang Province to explore the transformation currently underway in China's rural areas.
文摘As part of continued efforts to increase cultural understanding between China and other countries,four international experts embarked on an exploration of Chongqing Municipality and Sichuan Province from May 24 to 27.Dubbed the"Understanding China"tour,the program was organized by China International Communications Group(CICG)for the judges of the second Orchid Awards,whose shortlist of 30 nominees was announced on May 22.
文摘On the afternoon of September 29,2025,as part of the Beijing-Tianjin-Hebei Outstanding Popular Science Book Catalog Release and Popular Science Creation&Publishing Exchange Conference,the launch event for the English edition of Hi,I'm China was held at the Beijing Library.Xie Gang,vice president of China International Communications Group,and Nie Zhenning,head of the national reading committee at the Publishers Association of China,attended the event and officially unveiled the new book.Representatives of readers from multiple countries,along with experts and scholars from various fields,were invited to participate.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences under Grant No.XDA06010403the International Science and Technology Cooperation Program of China under Grant No.2013DFA10690+1 种基金the National Natural Science Foundation of China under Grant No.61003293the Beijing Natural Science Foundation under Grant No.4112054
文摘Web of Things （WoT） makes it possible to connect tremendous embedded devices to web in Representational State Transfer （REST） style. Some lightweight RESTful protocols have been proposed for the WoT to replace the HTTP protocol running on embedded devices. However, they keep the principal characteristic of the REST style. In particular, they support one-to-one requests in the client-server mode by four standard RESTful methods （GET, PUT, POST, and DELETE）. This characteristic is however inconsistent with the practical networks of embedded devices, which typically perform a group operation. In order to meet the requirement of group communication in the WoT, we propose a resource-oriented protocol called SeaHttp to extend the REST style by introducing two new methods, namely BRANCH and COMBINE respectively. SeaHttp supports parallel processing of group requests by means of splitting and merging them. In addition SeaHttp adds spatiotemporal attributes to the standard URI for naming a dynamic request group of physical resource. Experimental results show that SeaHttp can reduce average energy consumption of group communication in the WoT by 18.5%, compared with the Constrained Application Protocol （CoAP）.
