METHOD FOR COMPRESSING AND ENCRYPTING ENGLISH TEXT

摘要

PROBLEM TO BE SOLVED: To provide a system for managing English text by an encryption key (permutation) in which the English text is inputted and a compressed and encrypted code is outputted, where the compression ratio uses the G1entropy as the index. SOLUTION: This method comprises a compression process that uses preprocessing for permuting the codes which lower the G1entropy and a compression/expansion table of chaos based on an ASCII code distribution constituting preexamined English text. The encryption key (permutation) can be defined for both of the preprocessing table and the compression/expansion table of chaos. COPYRIGHT: (C)2004,JPO