Self-adaptive Image Encryption Algorithm Base on Chaos Choice

A new image encryption algorithm combined with high-dimensional chaos and multi—wheel choice encryption was presented.Firstly,original images was divided into 2×2 size blocks,the encryption orders of blocks was chosen by main key stream.Secondly,the XOR operation result of all pixels' grey scale value in the last block was used as initial of four—dimensional chaos key stream to composite encrypting the next block.A single wheel operation would complete while all four blocks were encrypted,and a new wheel was chosen by main key stream. The experiment result indicated that the new algorithm enhanced the conventional algorithm and the macro change of original pixels would influence more cryptograph pixels while operation time unchaged.