关键词: 脆弱水印, 图像认证, 小波变换, 哈希函数

Abstract: A novel fragile watermarking algorithm based on binary look-up-table (LUT) and Hash value in the discrete wavelet domain is proposed to overcome the security problems of block-wise independence watermarking schemes. Since the wavelet transform has space and frequency characteristic, we embed a marking watermark in the LL sub-band with the look-up-table method for the detection and localization tampering. Choose the Hash value of the HL sub-band or LH sub-band as another watermark to embed in HH sub-band for resisting the counterfeiting attacks. The experimental results demonstrate that the algorithm has both the effectiveness in resisting possible attacks and good ability of detecting local alterations.

Key words: fragile watermarking, image authentication, wavelet transform, hash function