Abstract: Due to the characteristics of medical image; huge data and high continuity of same color pixels, a medical image encryption algorithm based on chaos theory was proposed. hhe algorithm generates encryption array by randomly switcking among multiple one-dimensional chaos systems, introduces duplex feedback to the image data while encryp-ting,which lengthens the sequence period and improves the security of algorithm. Experiment results show that the algorithm has good running efficiency and encryption effect.

Key words: Medical image,Chaos encryption,Duplex feedback