ARITHMETIC COMPRESSION ENCRYPTOR, ARITHMETIC COMPRESSION ENCRYPTING METHOD, AND PROGRAM

摘要

An arithmetic compression encryptor is an arithmetic encoder, which encodes a symbol on the basis of the occurrence probability of the symbol output from a model unit for predicting the occurrence probability of the symbol, and controls a dynamic section linear mapping based on the occurrence probability of an input symbol through an encryption key to compress and encrypt an output code. This encryptor provides a high safety without damaging intrinsic data compression rate by arithmetic coding and disturbs the output code efficiently through a simple processing.