Altun Mountains National Nature Reserve Established in 1983,the Altun Mountains National Nature Reserve is located in the eastern Kunlun Mountains,within Ruoqiang County of the Bayingolin Mongol Autonomous Prefecture ...Altun Mountains National Nature Reserve Established in 1983,the Altun Mountains National Nature Reserve is located in the eastern Kunlun Mountains,within Ruoqiang County of the Bayingolin Mongol Autonomous Prefecture in Xinjiang Uygur Autonomous Region.Covering a vast area of 45,000 square km,it stands as one of China’s largest and most pristine protected areas.With an average elevation of 4,580 metres,it represents a quintessential plateau desert ecosystem.展开更多
The ubiquitous adoption of mobile devices as essential platforms for sensitive data transmission has heightened the demand for secure client-server communication.Although various authentication and key agreement proto...The ubiquitous adoption of mobile devices as essential platforms for sensitive data transmission has heightened the demand for secure client-server communication.Although various authentication and key agreement protocols have been developed,current approaches are constrained by homogeneous cryptosystem frameworks,namely public key infrastructure(PKI),identity-based cryptography(IBC),or certificateless cryptography(CLC),each presenting limitations in client-server architectures.Specifically,PKI incurs certificate management overhead,IBC introduces key escrow risks,and CLC encounters cross-system interoperability challenges.To overcome these shortcomings,this study introduces a heterogeneous signcryption-based authentication and key agreement protocol that synergistically integrates IBC for client operations(eliminating PKI’s certificate dependency)with CLC for server implementation(mitigating IBC’s key escrow issue while preserving efficiency).Rigorous security analysis under the mBR(modified Bellare-Rogaway)model confirms the protocol’s resistance to adaptive chosen-ciphertext attacks.Quantitative comparisons demonstrate that the proposed protocol achieves 10.08%–71.34%lower communication overhead than existing schemes across multiple security levels(80-,112-,and 128-bit)compared to existing protocols.展开更多
The year 2026 marks the 65th anniversary of the establishment of diplomatic relations between China and Laos.The bilateral relations are now at a new starting point where the past has been inherited and a course for t...The year 2026 marks the 65th anniversary of the establishment of diplomatic relations between China and Laos.The bilateral relations are now at a new starting point where the past has been inherited and a course for the future has been set.Looking back,China and Laos have weathered storms together and stood by each other.展开更多
文摘Altun Mountains National Nature Reserve Established in 1983,the Altun Mountains National Nature Reserve is located in the eastern Kunlun Mountains,within Ruoqiang County of the Bayingolin Mongol Autonomous Prefecture in Xinjiang Uygur Autonomous Region.Covering a vast area of 45,000 square km,it stands as one of China’s largest and most pristine protected areas.With an average elevation of 4,580 metres,it represents a quintessential plateau desert ecosystem.
基金supported by the Key Project of Science and Technology Research by Chongqing Education Commission under Grant KJZD-K202400610the Chongqing Natural Science Foundation General Project Grant CSTB2025NSCQ-GPX1263.
文摘The ubiquitous adoption of mobile devices as essential platforms for sensitive data transmission has heightened the demand for secure client-server communication.Although various authentication and key agreement protocols have been developed,current approaches are constrained by homogeneous cryptosystem frameworks,namely public key infrastructure(PKI),identity-based cryptography(IBC),or certificateless cryptography(CLC),each presenting limitations in client-server architectures.Specifically,PKI incurs certificate management overhead,IBC introduces key escrow risks,and CLC encounters cross-system interoperability challenges.To overcome these shortcomings,this study introduces a heterogeneous signcryption-based authentication and key agreement protocol that synergistically integrates IBC for client operations(eliminating PKI’s certificate dependency)with CLC for server implementation(mitigating IBC’s key escrow issue while preserving efficiency).Rigorous security analysis under the mBR(modified Bellare-Rogaway)model confirms the protocol’s resistance to adaptive chosen-ciphertext attacks.Quantitative comparisons demonstrate that the proposed protocol achieves 10.08%–71.34%lower communication overhead than existing schemes across multiple security levels(80-,112-,and 128-bit)compared to existing protocols.
文摘The year 2026 marks the 65th anniversary of the establishment of diplomatic relations between China and Laos.The bilateral relations are now at a new starting point where the past has been inherited and a course for the future has been set.Looking back,China and Laos have weathered storms together and stood by each other.
