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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。
Briefly introduce the origin and classification of subliminal channels, and discuss in detail the existence of subliminal signals in ElGamal and DSA digital signature scheme. Introduce “without threshold” and a simple protocol to avoid subliminal channel. Finally, Steganography, Implicit channel differences and relations.