In order to realize lossless covert communication in image

a novel lossless covert communication method based on integer linear transform was proposed. The method uses integer linear transformed vector instead of original vector and need not to save the message of the revisable vector. Using the method the host data with large capacity secret information embedded can be transmitted in open channels. Host image can be recovered without any distortion from the marked image after the hidden data have been extracted. The scheme had been simulated and good experimental results were achieved. It can be applied to keeping case history in medical images and can also be used for covert communication in remote sensing images

military images and etc.