A Non-symmetric Digital Image Secure Communication Scheme Based on Generalized Chaos Synchronization System

Based on a generalized chaos synchronizationsystem and a discrete Sinai map, a non-symmetric true color (RGB) digitalimage secure communication scheme is proposed. The scheme firstchanges an ordinary RGB digital image with 8 bits intounrecognizable disorder codes and then transforms the disordercodes into an RGB digital image with 16 bits for transmitting.A receiver uses a non-symmetric key to verify the authenticationof the received data origin, and decrypts the ciphertext. The schemecan encrypt and decrypt most formatted digital RGB imagesrecognized by computers, and recover the plaintext almost withoutany errors. The scheme is suitable to be applied in network imagecommunications. The analysis of the key space, sensitivity of keyparameters, and correlation of encrypted images imply that thisscheme has sound security.