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

AbstrcatA 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.