一种新的封闭ECDSA签名阈下信道方案

A New Sublim inal- free Protocol in ECDSA

阈下信道是指在公开信道中建立的实现隐蔽通信的信道,通信双方可以在普通的数字签名中传递秘密信息,除通信双方以外的任何人均不知道秘密信息的存在,可能对信息安全构成严重威胁。本文通过研究封闭阈下信道理论模型和方案,提出了一种新的封闭ECDSA阈下信道方案。该方案令看守参与签名的生成,但没有伪造签名的能力,从而在保证签名者的签名权力的前提下,实现了对因随机会话密钥而引入阈下信道的完全封闭。

The subliminal channel is a covert channel, comtmcted in the public channel in order to realize secret A covert message can be sent to an authorized receiver of signed messages by a signing party through the subliminal channel in a signature scheme and cannot be detected if no additional knowledge. Therefore, this may cause a serious threat to the security of information. A new subliminal-free protocol in ECDSA is designed through the research on the free and model of subliminal channel. In the process of the protocol, the warden covers all the data generated by the signer and finishes the signature, but he can not forge the signatures. It is the first time that subliminal channels exiting in random session keys in ECDSA are completely avoided.