无线信道中的密钥进化与加密  

Key Evolution and Encryption over Wireless Channels

作　　者：张平娟[1] 刘志宏[1] 张腾[1] 田森平[1] 

机构地区：[1]西安电子科技大学计算机学院,西安710071

出　　处：《计算机科学与探索》2015年第1期80-93,共14页Journal of Frontiers of Computer Science and Technology

基　　金：国家自然科学基金No.61173135~~

摘　　要：无线网络可以利用物理层的信道噪声来增强系统的安全性能。通常物理层安全协议针对特定无线信道的噪声特性进行设计,并假设窃听者的信道特性已知,但在实际中该假设是不可行的。针对无线信道的安全通信问题,提出了密钥进化协议,设计了基于动态秘密的加密机制,使合法用户的密钥随传输数据流不断进化,而不用假设敌手的信道特征已知。如果合法用户之间存在认证信道,即使敌手的信道相比合法用户的信道具有优势,合法用户之间也能建立安全的会话密钥。最后,提出了k容忍加密机制(k-resistance encryption scheme,k-RES),该机制能够容忍加密密钥和解密密钥之间最多k比特的差异。Physical-layer channel noise can be used to networks. In general, a physical-layer security protocol enhance the security performance of the system in wireless 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 pro- poses a key evolution scheme and designs an encryption mechanism based on dynamic secrets, allowing the legiti- mate users＇ keys to evolve continuously based on the transmitted messages over the noisy wireless channel with- out 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.

关 键 词：动态密钥 密钥进化 物理层安全 信息安全 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]