摘要
针对用户数量受限的应用环境,给出一种以一系列小的BIBD(balanced incomplete block design)关联矩阵取补转置得到的编码矩阵,替代单位标准正交阵中的非零元素构成2层的级联码,与混沌序列异或,并根据合谋假设计算并重复码字后分配给分组用户的数字指纹方案.基于该方案,研究了分组编码的区块矩阵的大小对编码抗合谋攻击的影响,讨论了用户分组的合理性原则.实验表明:选取大小相近的内码矩阵块并设置相对均衡的用户分组,对提高指纹编码的抗合谋攻击能力和编码效率有着积极的作用.
To study the applied environment with limited quantity of users, a serial small transposed matrixes of balanced incomplete block design was used in the digital fingerprint code method for limit ed users to replace the nonzero elements of unit matrix. A two-level code was built, and duplicates a few times based on the situation of collusion attacks and distributes to users was duplicated. Based on the scheme, the influence on the ability of anti-collusion attack brought from the size of block matrix was studied, and the principle of grouping users was analyzed. Research shows that it is helpful to im- prove the anti-collusion ability of the codeword and efficiency of encoding by choosing similar size block matrix and setting balanced usersr groups.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第10期5-8,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家高技术研究发展计划资助项目(2007AA01Z309)
中央高校基本科研业务费专项资金资助项目(2012-IV-058)
关键词
数据安全
图像处理
数字水印
数字指纹
泄密者追踪
分组方案
security of data
image processing
digital watermarking
digital fingerprint
trace trai- tor
grouping method
