隨機置換表中閉合狀態(tài)演化環(huán)的特征及其在分組加密中的應用
The Properties of Closed State Evolutive Ring in Random Permutation-Table and Its Application to Block Encryption
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摘要: 從Skipjack分組密碼的F表出發(fā)，對隨機置換表中閉合狀態(tài)演化環(huán)的環(huán)數出現概率和期望值、閉合狀態(tài)演化環(huán)的平均環(huán)長度等進行了研究，得到其封閉的計算式。為快速計算，分別尋找到它們的遞推關系式。數值模擬的實驗證實了理論結果的正確性。Abstract: In this paper the concept of random permutation table is presented from F table in Skipjack block encryption. The probabilities and the expected values of closed state evolutive ring numbers and the average length of state evolutive rings are studied and their closed forms used in computation are given. For quick computation their recurrence forms are obtained. The theoretical results are proved experimentally by numerical simulation.
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