隐写术中矩阵编码的保密安全性

摘要

针对矩阵编码在隐写码和湿纸码中的应用,基于信息论模型研究矩阵编码在不同攻击条件下的保密安全性.在已知载体攻击条件下,给出矩阵编码的密钥疑义度、消息疑义度和密钥的唯一解距.在选择载密攻击条件下,指出只需n个差分方程组即可恢复矩阵编码的共享密钥.%Based on an information theory model,the cryptographic security of matrix encoding,which can be applied in steganographic codes or wet paper codes,under different attack conditions was studied. The cryptographic security about matrix encoding under the condition of known-cover attack with key equivocation,message equivocation and unicity distance of stego-key was presented. The result that n groups of differential equations could sufficiently recover the share key of matrix encoding under the condition of chosen-stego attack was pointed out.