分析EPaillier等提出的公钥概率加密体制的安全性,证明它的单向性与几类问题的等价关系,进一步证明了在不降低安全性的前提下,可以通过选取适当的参数,提高体制的效率,减少通信量,在此基础上给出改进的加密体制,加密和解密的效率比以往的体制有了很大的提高。
Security analysis of P. Paillier(etc)'s public-key encryption scheme(P-P) is proposed. Equivalent relations of one-wayness of P-P encryption scheme with other problems are verified. So without lowering the security, this paper improves the efficiency and reduces the data to be transferred by using proper parameters. The improved encryption scheme is specified, with the process of encryption/decryption being more efficient than that of P-P encryption scheme.