密码算法和协议中的阈下信道

Subliminal Channels in Cryptography

简要介绍阈下信道的由来及分类,详细论述ElGamal和DSA数字签名方案中存在的阈下信近;介绍“无阈下”和一个可避免阈下信道的简单协议;最后,说明阈下通信与隐写术、隐通道的区别与联系。

This paper recounts the development of subliminal channels from their origins, then focus on these channels of ElGamal and DSS.and introduces the definition and a simple protocol of subliminal-free. Finally, the differences of subliminal channels and covert channels are given.