2个基于身份代理签名方案的安全性分析及改进
Cryptanalysis and Improvement of Two Identity-Based Proxy Signature Schemes
云南民族大学学报:自然科学版,2012,21(4):295-297

吴晨煌 WCH

摘要


通过对向新银等人提出的新的强指定验证人代理签名方案进行分析,指出该签名方案存在安全缺陷,即代理签名人能够得到原始签名人的私钥,从而代理签名人能做原始签名人所能做的任何事情.同样的安全缺陷还存在于张学军等人给出的基于身份无可信中心的代理签名方案中.最后,对该签名方案进行了改进,改进后的签名方案的安全性是基于CDH问题的. In this paper, a new identity-based strong designated verifier signature scheme,which is proposed by Xiang Xinyin, etc., is analyzed and a serious security flaw is discovered in their scheme, because the private key of the original signer can be recovered by the proxy signer. Therefore, the proxy signer can do what the original signer can do. Unfortunately, the same security flaw is also found in a new identity-based proxy signature scheme without trusted PKG proposed by Zhang Xuejun, etc.. Finally, an improved scheme is proposed, whose security is based on the CDHP.

参考



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