公开验证认证加密Ma-Chen方案的改进An Improvement of the Authenticated Encryption Ma-Chen Program Certificated Publicly
魏钦冰
摘要(Abstract):
现有的认证加密方案中,如果签名者否认签名,接收者不能向其它任何验证者证实签名者的诚实性。为了解决此问题,Ma-Chen提出了一个有效的公开验证认证加密方案。而文中证明了他们的方案不能抵制基于单向Hash函数的特殊攻击,即不诚实的接收者对任何消息都可成功地伪造签名者的签名;然后在只基于求解离散对数难题和对消息增加冗余度的基础上,提出了一种改进方案。改进方案不仅具有不可伪造性、不可否认性和机密性等特点,而且在计算复杂性等方面优于Ma-Chen方案。
关键词(KeyWords): 认证加密;离散对数问题;消息恢复;数字签名
基金项目(Foundation):
作者(Author): 魏钦冰
DOI: 10.16393/j.cnki.37-1436/z.2007.05.032
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