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C.B.Roellgen多态密码机制(PMC)广泛应用于磁盘文件的加密,具有强安全性和高速性等优点,但不适用于复杂的网络应用环境.针对该问题对PMC进行了改进,提出了满足严格雪崩准则(SAC)的强单向函数和构造S盒的新方法,使构造满足SAC函数的方法更加方便快捷.最后从满足SAC方面分析和验证了该方法的安全性.实验结果表明,改进后的PMC能快速而大量地产生符合密码学特性的长周期序列,并形成网络环境中通信双方会话的对称密钥.
CBRoellgen Polymorphic Cryptography (PMC) is widely used in the encryption of disk files, with the advantages of strong security and high speed, but it is not suitable for complex network application environment.On the basis of this problem, PMC has been improved, The strong one-way function of avalanche criterion (SAC) and the new method of constructing S-box make the method of constructing SAC function more convenient and faster.Finally, the security of this method is analyzed and verified from the aspect of satisfying SAC.The experimental results show that after the improvement PMC can quickly and largely generate long-period sequences that conform to cryptographic characteristics and form a symmetric key for both parties of communication in a networked environment.