A Linear Algorithm for the Cyclic Permutation(CP) to the N and Its Formal Derivation 计算循环置换乘方的线性算法及其形式推导
Cyclic shift permutation structure is an important part of partial parallel decoder for quasi-cyclic LDPC codes. 循环移位置换单元是准循环LDPC码的部分并行译码器的重要组成部分。
By investigating the period distributions of codes, one can obtain better non-linear cyclic codes, as well as weight codes and permutation codes with stronger error-correction capabilities. 探究循环码的周期分布,可以给出更好的非线性循环码,构造纠错能力更强的重码和置换码等,具有实际应用价值。
We also present two new cryptographic indexes, fixed point and cyclic structure, on which we investigate the performance of such permutation. 针对幂置换,提出了两个密码安全指标:不动点和循环结构;证明了幂置换在这两个指标下的密码性能;