Image Secret Key Generation Method Based on Bit Extraction

Bit extraction method from chaos sequence was proposed in the paper to realize image communication secretly. The cipher comes from nonlinear chaos iteration by seeds and processing of bits transformation matrix. First, the principle of image encryption keys was described, the cipher sequence features was calculated. Secondly, the security of cipher was analyzed. Finally, the experiments were completed successfully for image encryption and decryption. The result is that the cipher sequence is with chaotic characteristics and pseudo randomness, and the cipher pool is huge. The conclusion is the bit extraction method with matrix may be used to calculate cipher keys for image confidential communications with high security.