Abstract: Security is precondition for application of Image Hidden Communication. There is lack of constraint condilions in security based on Shannon information entropy and relative entropy, because of steganalysis by image spatial corrclativity. We presented generalized information entropy, relative entropy and probability distribution, by means of analysis for correlativity of adjacency pixels of image. A security model for data hiding based on generalized information measure was proposed. The model is suitable for Image Hidden Communication and the hidden data can't be detected.Security constraint conditions and a method of steganography were derived, and we gave experimental data to verify the model. The experiment results indicate that the security model has values of theory and application.

Key words: Data hiding, Image hidden communication, Generalized information, Data hiding security