关键词: 图像认证, 双水印, 混沌, 安全性, 篡改恢复质量

Abstract: To improve the security of dual self-recovery watermark, a chaos-based dual selfrecovery watermark scheme for image authentication was proposed in this paper. In the proposed scheme, the chaotic map was first adopted to encrypt the dual watermark data, and then the data were embedded into the image block of less significant bits. And then the authentication data of each block was randomly generated with reference to its content and the recovery watermark embedded according to the chaotic mapping. Theoretical analysis and simulation results show that the proposed scheme can not only maintain the good tamper recovery quality and invisibility of dual self-recovery watermark, but also improve the security against the only-content tampering attack and the dictionary searching attack.

Key words: image authentication, dual watermark, chaos, security, tamper recovery quality