摘要： Simmons提出了阈下信道的概念,给出了在可认证的消息中没有安全信道仍可传递秘密消息的方法,随后在基于离散对数困难的ElGamal、DSA数字签名方案中实现阈下信道;零知识证明是密码学中非常重要的工具,针对基于零知识证明方法和基于尝试法封闭阈下信道的数字签名方案,论证了在相应的数字签名方案中仍能构造阈下信道,并对其安全性作出了分析,最后讨论了阈下信道的应用实例。

关键词: 阈下信道, 数字签名, 零知识证明

Abstract: Subliminal channel is proposed by Simmons, he showed a method that a message authentication without secrecy channel transferring secret message. Subsequently, subliminal channel is implemented in ElGamal, DSA which based on the difficulty of discrete logarithms. Zero-knowledge proof is an important tool in cryptology, a digital signature scheme based on zero-knowledge proof or “cut and chose” is regarded as resist subliminal channel. The possibility of constructing subliminal channel in these digital signature scheme is analyzed, the security and application of subliminal channel is discussed also.

中图分类号: 

• TP309