Arithmetic type compressed and encrypted decoding apparatus and arithmetic type compressed and encrypted devices

摘要

An arithmetic encoder for encoding of the symbol based on the probability of occurrence of the symbols output from the model unit that predicts the probability of occurrence of symbols, arithmetic type compressor cryptographic apparatus of the present invention, the appearance of the symbols entered to encrypt and compress the output code by controlling an encryption key dynamic piecewise linear mapping based on probability. According to the compressed and encrypted type arithmetic apparatus of the present invention, without impairing the data compression ratio of the original by the arithmetic coding, it is possible to obtain a high safety. Also, it is possible to disturb the output code efficiently in a simple process.