Encryption of Multiple Sequential Images Using Blind Source Separation
基于盲源分离的多幅顺序图像加密方法

Since the security of many cryptosystems relies on the apparent intractability of the computational problems, the underdetermined problem of Blind Source Separation (BSS) is used to encrypt multiple images with high security. However, due to the BSS ambiguity, the order of BSS decrypted images may different from that of the original images and the value of pixel in some decrypted images may be reversed, which can result in decryption errors when encrypting multiple sequential images. To solve this problem, digital watermarking technique is utilized to embed some order information into each original image before encryption. After decryption, these order information is extracted from the decrypted images and then used to eliminate the decryption errors. Computer simulation results show that the proposed method not only can recover the original order of the decrypted images, but also can detect if the decrypted images are reversed.