计算机科学 ›› 2014, Vol. 41 ›› Issue (11): 208-211.doi: 10.11896/j.issn.1002-137X.2014.11.041
孙华,孟坤
SUN Hua and MENG Kun
摘要： 环签密是一个重要的密码学术语,它结合了加密和环签名的功能,具有保密性、可认证性和匿名性等安全属性。目前已有的无证书环签密方案大都是在随机预言模型下提出的,然而在该模型下可证安全的方案在哈希函数实例化后有时却并不安全。针对这一问题,设计了一个标准模型下可证安全的无证书环签密方案,并通过计算Diffie-Hellman (CDH)困难问题假设和判定性Diffie-Hellman (DBDH)困难问题假设,证明了方案满足适应性选择密文攻击下的不可区分性以及适应性选择消息攻击下存在的不可伪造性,因而方案是安全有效的。
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