使用阈下信道的可逆R-S数字水印

由于难以获得足够的冗余水印容量,一些面向内容认证的可逆水印方案仅嵌入了用对称算法加密的杂凑值,它的数据尺寸显著地小于数字签名,但这使不诚实的验证者能伪造合法的内容.然而研究发现,虽然当前公钥签名的长度是杂凑值的数倍,但通过使用阈下信道,在方案中引入公钥签名仅需增加数个字节的容量.据此,一个改进的R-S(regular-singular)可逆数字水印方案被提出,它采用RSAPSS公钥签名,并利用签名中阈下信道存储部分或全部压缩的R-S向量.该方案仅需增加4个字节的额外水印容量,也具有篡改定位功能和可靠的安全性.

Reversible R-S Digital Watermarking Using the Subliminal Channel

Because of the difficulty of making adequate redundant capacity for watermarking,some reversible watermarking schemes for content authentication just embed a symmetrically encrypted hash value,the size of which is significantly smaller than that of a digital signature.It makes a dishonest verifier be capable of fabricating legal contents.However,the research finds that introducing a public-key signature,which is usually several times longer than a hash code,can only need several bytes more capacity if the s...