《计算机应用研究》|Application Research of Computers

基于PN码随机化的MSAC攻击防御方法

PN code randomization based MSAc attack resistance method

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作者 许新忠,张连成,燕菊维
机构 1.河南艺术职业学院,郑州 450011;2.数学工程与先进计算国家重点实验室,郑州 450001
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文章编号 1001-3695(2020)06-037-1789-05
DOI 10.19734/j.issn.1001-3695.2018.11.0891
摘要 基于流速率的直序扩频(DSSS)流水印技术在嵌入多比特的水印信息时采用同一伪随机(PN)码,使得已标记数据流具有自相似性,均方自相关(MSAC)攻击通过单条已标记数据流就可检测DSSS流水印的存在性,严重破坏了DSSS流水印的隐蔽性。PN码正交化方法虽可消除已标记数据流的自相关性,进而抵御MSAC攻击的检测,但正交PN码难以生成,应用范围受限。为此,提出基于PN码随机化的MSAC攻击防御方法,在向目标数据流嵌入每个水印位时均采用随机选择的不同长度的PN码进行扩展,使得已嵌入DSSS流水印的数据流速率的均方自相关不再呈现周期性峰值,进而可在MSAC攻击面前保持隐蔽性。理论分析与实验结果表明,基于PN码随机化的MSAC攻击防御方法可有效抵御MSAC攻击的检测,且所采用的PN码易于生成,便于部署和应用。
关键词 流水印; 直序扩频; 均方自相关攻击; PN码正交化; PN码随机化
基金项目 国家自然科学基金资助项目(61402526,61402525)
本文URL http://www.arocmag.com/article/01-2020-06-037.html
英文标题 PN code randomization based MSAc attack resistance method
作者英文名 Xu Xinzhong, Zhang Liancheng, Yan Juwei
机构英文名 1.Henan Vocational College of Art,Zhengzhou 450011,China;2.State Key Laboratory for Mathematical Engineering & Advanced Computing,Zhengzhou 450001,China
英文摘要 The flow rate based direct sequence spread spectrum(DSSS) flow watermarking technique used the same pseudo-random(PN) code to modulate the multi-bit watermark signal, as a result, the DSSS watermarked flow had self-similarity, and the mean-square autocorrelation(MSAC) attack could detect the existence of the DSSS flow watermark by using single DSSS watermarked flow, which seriously destroyed the stealthiness of the DSSS flow watermark. Although the PN code orthogonalization method could eliminate the autocorrelation of the DSSS watermarked flow and thus resisted the MSAC attack, how-ever, the orthogonal PN codes were difficult to generate, which limited its application range. Therefore, this paper proposed the PN code randomization based MSAC attack resistance(PNCR-MAR) method, when it embedded the watermark signal into the target flow, the PN codes of different lengths, randomly selected from a PN code set, and used to spread each watermark bit, so that the mean-square autocorrelation of the flow rate of the watermarked flow no longer exhibited periodic peaks, as a result, this PNCR-MAR method could defend against the MSAC attack. Theoretical analysis and experimental results show that this proposed PNCR-MAR method can effectively resist the MSAC attack, and the adopted PN codes are easy to generate, which is suitable for deployment and application.
英文关键词 flow watermarking; direct sequence spread spectrum; mean-square autocorrelation attack; pseudo-noise code orthogonalization; pseudo-noise code randomization
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收稿日期 2018/11/26
修回日期 2019/1/16
页码 1789-1793
中图分类号 TP393.08
文献标志码 A