Combination Algorithm of Active and Passive Security Protection for Image Based on Arnold Transform

This paper proposes an image combination algorithm of active and passive security protection. The algorithm is realized by adjusting the passive protection information embedding algorithm according to active Arnold transform´s periodicity. By means of this algorithm, the passive protection information can be extracted conveniently from the image´s ciphertext without decoding and it still exists in the image´s plaintext after decryption. This paper will introduce the research background firstly, and then, after the details of algorithm, processed images and experimental results are presented. In the end, the future orientation is pointed out.