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Cryptographic properties of the single cycle T-function's output sequences are investigated.Bounds of autocorrelation functions of the kth coordinate sequence and bounds of state output sequence are calculated respectively.The Maximum Sidelobe Ratio(MSR) of the kth coordinate sequence and the MSR of state output sequence are given respectively.The bounds of autocorrelation functions show that the values of autocorrelation functions are large when shifts are small.Comparisons of the autocorrelations between ... 相似文献
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多变量公钥密码体制中存在多个私钥对应于同一个公钥的等价密钥问题.提出了Plus保形变换,并给出了其表达形式.用Plus保形变换和其他保形变换研究了几类多变量公钥密码体制的等价密钥问题.证明了只有用Big保形变换和Frobenius保形变换,才能得到Square体制的等价密钥.结果表明,任一公钥都有指数级个私钥与之对应,从而使私钥空间大量减少;多变量公钥密码体制要达到预定的安全强度,必须提高体制参数的大小.同时,使用私钥仿射结构具有稀疏性的标准形式,能有效地减少运算量,提高存储效率. 相似文献