关键词: 动态密钥, 密钥进化, 物理层安全, 信息安全

Abstract: Physical-layer channel noise can be used to enhance the security performance of the system in wireless networks. In general, a physical-layer security protocol is tailored to the channels and relies on the assumption that knowledge on the eavesdropper’s channel is available. However, this assumption is not practical. This paper focuses on the problem of developing key agreement schemes for secure communication across wireless channel, and proposes a key evolution scheme and designs an encryption mechanism based on dynamic secrets, allowing the legitimate users’ keys to evolve continuously based on the transmitted messages over the noisy wireless channel without assuming that the channel characteristics of the enemy are known. Even if the eavesdropper’s channel is superior to the legitimate receiver, the legitimate parties can establish secret keys. Finally, this paper proposes a novel k-resistance encryption scheme (k-RES) that can use different keys to encrypt and decrypt messages if there are no more than k bits difference between the encryption and decryption keys.

Key words: dynamic keys, key evolution, physical-layer security, information security