自嵌入空域易损水印技术

提出了一种新颖的自嵌入易损水印技术用于图像的完整性认证．提出引入基于图像的不确定性来克服其他算法中存在的安全缺陷．通过结合图像特征及相机密钥来产生基于图像的密钥来实现这一目的．相机密钥的惟一性解决了密钥的管理问题．算法把图像本身的信息作为水印嵌入，认证时可直接进行而不需要其他的水印参照信息．给出了性能分析，表明当嵌入的信息量较大时可以得到较高的篡改检测概率．分析了可能的攻击方式并给出了相应的攻击概率和检测概率．实验结果表明该算法是有效的．

Self-Embedding Spatial Fragile Watermarking Technique

A novel self-embedding fragile watermarking technique is proposed for image integrity authentication, where image-dependent uncertainty is introduced to overcome the security problem existing in most algorithms. This purpose is implemented by using an image-dependent key that is obtained by combining image features with one camera key. The problem of key management is also solved because of the uniqueness of camera key. In watermark embedding, image message is used as the fragile watermark so that no reference watermark is needed in authentication. Performance analysis is given, which shows that larger probability of tamper detection can be achieved when larger amount of image message is embedded. Possible attacks are also analyzed and the probabilities of successful attack and detection are given respectively. Finally, the experimental results are presented to demonstrate its effectiveness.