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分析了 Chang方案中存在的一些不安全因素 ,给出一个针对 Chang方案的攻击方法 ,并在此基础上提出一个改进的 Chang方案 .该方案具有高强度的加密强度、容错性、不可篡改和不可重播等特点 .改进方案体现了数据签名、容错技术和 RSA加密的紧密结合给公钥加密带来的新思路 .
This paper analyzes some insecurity factors existing in the Chang scheme and gives an attack method for the Chang scheme. Based on this, an improved Chang scheme is proposed, which has high strength of encryption, fault tolerance, Replay, etc. The improved scheme embodies the new ideas brought by the close combination of data signature, fault tolerance technology and RSA encryption to public key encryption.