序列密码和分组密码的混合加密体制研究

Study of a kind of hybrid encryption system based on both stream and block ciphers

在Shannon的密码体制上,文章将序列密码和分组密码结合而成为一种混合密码体制,该加密体制综合利用两种密码体制的特性来得到较高的安全性。通过序列密码产生分组密码所用的密钥流,对密钥流分组得到各分组密钥,这种加密方法克服了混合分组加密各分组密文有相关性的缺陷,从而使传输中的错误不会影响密文的解密,从而达到使用固定密钥实现一次一密。

<Abstrcat>A new model of cryptosystem based on the combination of stream ciphers with block ciphers is founded on the basis of the theory of Shannon. The new model integrates the characteristics of both cipher systems to achieve higher security. Keys generated from stream ciphers are used for block ciphers. The bit error in transmission has no influence on block ciphers because there is no correlation among the blocks. Construction of suites of random key stream from a given key can be designed.