Multiple Security Protection Algorithm for GF-2 Images Based on Commutative Encryption and Watermarking

Abstract

In the process of storage, transmission and use of GF-2 image, both data security transmission and data copyright protection should be considered. The combination of cryptography and digital watermarking is an effective way to solve this problem. However, there are some problems in the existing algorithms that combine cryptography with digital watermarking, such as high operation sequence requirements, low security, and easy leakage of keys. To solve these problems, a new multiple security protection algorithm for GF-2 image based on commutative encryption and watermarking is proposed in this paper. The integer wavelet transform is used to decompose the original GF-2 image at first, and the low frequency data is extracted and is divided into sub-block with the size of m × n. Then, each sub-block is encrypted and watermarked based on the additive homomorphism of Paillier algorithm. Finally, all sub-blocks that completed the CEW operation are merged, and the merged data is performed inverse IWT to generate the encrypted-watermarked data. The proposed algorithm can achieve both security transmission by encryption and copyright protection by watermark, and the encryption algorithm and the watermarking algorithm are commutative. In addition, the watermark can be extracted from both ciphertext data and plaintext data.