Abstract:

Combining DNA cryptography with chaotic system,we present a color image encryption algorithm based on DNA sequence. This algorithm applies addition,subtraction and xor operations to DNA sequence,and decomposes a color image into bitplanes.We firstly decompose a color image into bitplanes and encode the them by DNA sequence.Likewise,we perform scrambling,addition and xor operations on every DNA-plane.Then,we decode the DNAplanse and compose the bitplanes into an encrypted image.Experimental results show that the encrypted image is noiselike,highly sensitive to the keys, has a flat histogram,good randomness and low correlation between two adjacent pixels.

Key words: DNA sequence;bitplane;image encryption;Chen’s chaos