摘要
在分析H artung提出的基于扩频的非对称水印方案的基础上,提出了一种新颖的公钥生成策略。此策略对嵌入水印时所需要的密钥进行随机双位循环变换生成水印检测时的公钥,生成的公钥和嵌入密钥有较好的相关性,并且攻击者利用生成的公钥无法估算出私钥,从而利用此策略改进的扩频非对称水印方案,提高了水印的检测效果,较好地保证了水印的安全性。
The asymmetric watermarking scheme based on spread spectrum proposed by Hartung is analyzed at first in this paper and then a novel tactic of producing public key is proposed.In this tactic ,the watermark checking key is produced by the embedding key through random pair-bits-circular transform,and the public key has good similarity with the embedding key,the attacker can not estimate the private key from the public key.So the improvement asymmetric watermarking scheme based on this tactic improves the watermark checking effect,and assures the watermark security well.
出处
《计算机工程与应用》
CSCD
北大核心
2005年第30期96-98,共3页
Computer Engineering and Applications
基金
国家自然基金课题(编号:10273015)
湖南省教育厅资助科研项目(编号:3B033)资助
关键词
非对称水印
公钥
扩频
随机双位循环变换
asymmetric watermark, public key, spread spectrum, random pair-bits-circular transformation
