Abstract:

In order to solve the security problem during the transmission of digital image, according to the analysis of traditional image encryption using high\|dimension chaotic system, an improved algorithm of image encryption is given. It combines the methods of position shuffling and pixel value substituting in iterations, and makes the encrypted datastream having relation to the plaintext. It resolved the bugs of traditional algorithm in application. The results of theoretical analysis and simulated experiment show that the algorithm guarantees the security of encryption effectively and excellent effect of encryption, the encrypted result varies sensitively with any minimal changes of the initial secret key and the plaintext, the value of adjacent pixels satisfy zero correlation, showing that the algorithm is feasible, security and easy to operate.

Key words:  image encryption, chaotic technology, image scrambling