Physical layer security(PLS)has become a critical technique for the rapidly expanding communication network in the postquantum era,supporting superior secure communication rates with lower deployment cost.Typical PLS ...Physical layer security(PLS)has become a critical technique for the rapidly expanding communication network in the postquantum era,supporting superior secure communication rates with lower deployment cost.Typical PLS architecture follows the“key distribution before encrypted communication”paradigm,which causes redundant system structure and potential security issues.We propose an intrinsic physical layer secure communication architecture aided by a joint secure key distribution technique in this article.The architecture utilizes random time-varying polarization evolution induced by the fiber channel as the entropy source and estimated bit error rate information as the medium to implement an intrinsic key distribution scheme without requiring additional channels and complex devices.We realize simultaneous physical layer encrypted transmission and error-free joint secure key distribution(SKD)based on this architecture.The experimental demonstration verifies the feasibility of the scheme.We believe the highly integrated secure communication architecture with multiple guaranteed security measures may not only provide a feasible,low-cost solution for the deployment of the SKD system in a variety of communication scenarios,but also propose a“key distribution within encrypted communication”paradigm for future PLS solutions.展开更多
基金supported by the Fund from Science,Technology and Innovation Commission of Shenzhen Municipality(Grant No.JCYJ20230807143712025)the National Natural Science Foundation of China(Grant No.62175077)。
文摘Physical layer security(PLS)has become a critical technique for the rapidly expanding communication network in the postquantum era,supporting superior secure communication rates with lower deployment cost.Typical PLS architecture follows the“key distribution before encrypted communication”paradigm,which causes redundant system structure and potential security issues.We propose an intrinsic physical layer secure communication architecture aided by a joint secure key distribution technique in this article.The architecture utilizes random time-varying polarization evolution induced by the fiber channel as the entropy source and estimated bit error rate information as the medium to implement an intrinsic key distribution scheme without requiring additional channels and complex devices.We realize simultaneous physical layer encrypted transmission and error-free joint secure key distribution(SKD)based on this architecture.The experimental demonstration verifies the feasibility of the scheme.We believe the highly integrated secure communication architecture with multiple guaranteed security measures may not only provide a feasible,low-cost solution for the deployment of the SKD system in a variety of communication scenarios,but also propose a“key distribution within encrypted communication”paradigm for future PLS solutions.
