摘要: We consider the enciphering of a data stream while it is being compressed by dictionary algorithm. This scheme has to be compared classical encryption after compression methods used in security protocols. Actually, most cryptanalysis techniques exploit patterns found plaintext crack cipher and reduce these attacks. Our based on LZ algorithm which Vernam been included. first present an experiment with pseudo-random sequence generated simple linear feedback shift register before considering sequences cellular automata. make some remarks trying measure randomness our method statistical tests. Such could employed increase speed protocols decrease computing power for mobile devices.