【摘要】 当前多数认证加密方案存在以下问题 :1)当签名者否认签名时 ,接收者不能向其它验证者证明签名者的诚实性 ;2 )当消息很长时 ,通信代价和计算代价将会很大 ,为了解决这些问题 ,设计出一种可转换的消息链接认证加密新方案 ,与其它消息链接认证加密方案相比 ,该方案通信代价和计算复杂度都比较小 ,并且在该方案中 ,当签名者否认签名时 ,接收者在没有签名者合作的情况下 ,可单独将该认证加密签名转换为一段签名 .更多还原

【Abstract】 Most of currently authenticated encryption schemes have the following problems: i) The receiver cannot prove the signer’s dishonesty to anyone if the signer denies his/her signature; ii) The communication cost and the computation cost are too high if the message is large. To solve the above problems, a new convertible authenticated encryption scheme with message linkages has been proposed. The new scheme requires smaller bandwidth and computational time as compared to the previously proposed authenticated encryption schemes with message linkages. In the new scheme, the recipient can prove the dishonesty of the signer by converting the signature into an ordinary one without the cooperating of the signer if the signer repudiates the signature.更多还原