Data Hiding in Image Size Invariant Visual Cryptography

This paper proposes a scheme to hide some confidential data in image size invariant visual cryptography. The data hiding processing is synchronized with the secret image encryption. The basic property of the conventional visual cryptography is well maintained in our scheme. That is, the secret information can be decrypted by stacking the two transparencies. Besides, the hidden data can be accurately retrieved and the secret image can be losslessly reconstructed, both with XOR operations. Experimental results show our scheme is simple and effective.