des算法實(shí)驗(yàn)報(bào)告-wenkub
2023-05-28 18:48:26 本頁(yè)面
【正文】 e(TM) i52430M CPU (4 CPUs) ,~內(nèi)存：2048MB RAM2．使用軟件：(1) 操作系統(tǒng)：win7 旗艦版(2) 軟件工具：Microsoft Visual c++ 二、實(shí)驗(yàn)涉及的相關(guān)概念或基本原理 DES是一個(gè)分組密碼算法，使用64位密鑰（除去8位奇偶校驗(yàn)，實(shí)際密鑰長(zhǎng)度為56位）對(duì)64比特的數(shù)據(jù)分組（二進(jìn)制數(shù)據(jù)）加密，產(chǎn)生64位密文數(shù)據(jù)。 (1)初始置換IP。上述換位處理的輸出，中間要經(jīng)過(guò)16輪加密變換。 64位的密鑰先由置換選擇1減少至56六位，進(jìn)行循環(huán)左移，然后通過(guò)置換選擇2減少至48位。因此，密鑰去掉第124……64位減至56位，所以實(shí)際密鑰長(zhǎng)度為56位。密鑰壓縮換位表如表5表6所示。三、實(shí)驗(yàn)內(nèi)容流程圖：主要代碼：①初始置換unsigned char Initial [] ={58, 50, 42, 34, 26, 18, 10, 2,60, 52, 44, 36, 28, 20, 12, 4,62, 54, 46, 38, 30, 22, 14, 6,64, 56, 48, 40, 32, 24, 16, 8,57, 49, 41, 33, 25, 17, 9, 1,59, 51, 43, 35, 27, 19, 11, 3,61, 53, 45, 37, 29, 21, 13, 5,63, 55, 47, 39, 31, 23, 15, 7}。⑤S盒置換unsigned char S_Box[8][4][16] ={/* S1 */{ {14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9,0, 7},{0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9,5, 3, 8},{4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7,3, 10, 5, 0},{15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3,14, 10, 0, 6, 13}},/* S2 */{ {15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0,5, 10},{3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9,11, 5},{0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9,3, 2, 15},{13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12,0, 5, 14, 9}},/* S3 */{{10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4,2, 8},{13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12,11, 15, 1},{13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12,5, 10, 14, 7},{1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3,11, 5, 2, 12}},/* S4 */{ {7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4,15},{13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10,14, 9} ,{10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5,2, 8, 4},{3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11,12, 7, 2, 14}},/* S5 */{{2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14,9},{14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9,8, 6},{4, 2,
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