两个具有语义安全的可转换认证加密方案

提出了两个具有语义安全的可转换认证加密方案,方案具有以下性质:能够提供消息的语义安全——任何攻击者,即使获得了一个认证加密签名,也无法确定他所猜测的消息是否为真正的消息;收到签名后,接收者只用自己的私钥和签名者的公钥来恢复、验证消息;如果签名者后来否定签名,接收者可以通过恢复的消息和其它一些相关参数向任何第三方证明签名者的欺骗。

Two Convertible Authenticated Encryption Schemes with Semantic Security

This paper proposes two convertible authenticated encryption schemes with semantic security,which have the following characteristics:Each scheme could provide semantic security for the message,that is,any adversary cannot determine whether his guessed message is the actual message signed by the signer even if he gets a valid signature;After receiving a signature,the receiver can recover and then verify the message by only using his secret key and the signer's public key;If the signer wants to repudiate his signature later,the receiver could prove the dishonesty of the signer to any third party by revealing the recovered message and some other related parameters.