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des算法實(shí)現(xiàn)過(guò)程分析,des算法實(shí)現(xiàn)過(guò)程分析頁(yè)數(shù)：8字?jǐn)?shù)：2305des算法實(shí)現(xiàn)過(guò)程分析1.????處理密鑰: 1.1??從用戶處獲得64位密鑰.(每第8位為校驗(yàn)位,為使密鑰有正確的奇偶校驗(yàn),每個(gè)密鑰要有奇 ?????數(shù)個(gè)”1”位.(本文如未特指，均指二進(jìn)制位) 1.2????具體過(guò)程: 1.2.1????對(duì)密鑰實(shí)施變換,使得變換以后的密鑰...
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DES算法實(shí)現(xiàn)過(guò)程分析
頁(yè)數(shù)：8 字?jǐn)?shù)：2305
DES算法實(shí)現(xiàn)過(guò)程分析
1.????處理密鑰: 1.1??從用戶處獲得64位密鑰.(每第8位為校驗(yàn)位,為使密鑰有正確的奇偶校驗(yàn),每個(gè)密鑰要有奇 ?????數(shù)個(gè)”1”位.(本文如未特指，均指二進(jìn)制位) 1.2????具體過(guò)程: 1.2.1????對(duì)密鑰實(shí)施變換,使得變換以后的密鑰的各個(gè)位與原密鑰位對(duì)應(yīng)關(guān)系如下表所示: ?????????表一為忽略校驗(yàn)位以后情況 1??????2?????3?????4?????5?????6?????7?????8?????9????10????11????12????13????14????15????16????17????18????19????20????21????22????23????24????25????26????27????28 57????49????41????33????25????17?????9?????1????58????50????42????34????26????18????10?????2????59????51????43????35????27????19????11?????3????60????52????44????36 29????30????31????32????33????34????35????36????37????38????39????40????41????42????43????44????45????46????47????48????49????50????51????52????53????54????55????56 63????55????47????39????31????23????15?????7????62????54????46????38????30????22????14?????6????61????53????45????37????29????21????13?????5????28????20????12?????4 1.2.2??把變換后的密鑰等分成兩部分,前28位記為C[0], 后28位記為D[0]. 1.2.3??計(jì)算子密鑰(共16個(gè))， 從i=1開始。 1.2.3.1 分別對(duì)C[i-1],D[i-1]作循環(huán)左移來(lái)生成C[i],D[i].(共16次)。每次循環(huán)左移位數(shù) ????????如下表所示： 循環(huán)次數(shù)????1????2????3????4????5????6????7????8????9????10????11????12????13????14????15????16 左移位數(shù)????1????1????2????2????2????2????2????2????1?????2?????2?
頁(yè)數(shù)：8 字?jǐn)?shù)：2305
DES算法實(shí)現(xiàn)過(guò)程分析
1.????處理密鑰: 1.1??從用戶處獲得64位密鑰.(每第8位為校驗(yàn)位,為使密鑰有正確的奇偶校驗(yàn),每個(gè)密鑰要有奇 ?????數(shù)個(gè)”1”位.(本文如未特指，均指二進(jìn)制位) 1.2????具體過(guò)程: 1.2.1????對(duì)密鑰實(shí)施變換,使得變換以后的密鑰的各個(gè)位與原密鑰位對(duì)應(yīng)關(guān)系如下表所示: ?????????表一為忽略校驗(yàn)位以后情況 1??????2?????3?????4?????5?????6?????7?????8?????9????10????11????12????13????14????15????16????17????18????19????20????21????22????23????24????25????26????27????28 57????49????41????33????25????17?????9?????1????58????50????42????34????26????18????10?????2????59????51????43????35????27????19????11?????3????60????52????44????36 29????30????31????32????33????34????35????36????37????38????39????40????41????42????43????44????45????46????47????48????49????50????51????52????53????54????55????56 63????55????47????39????31????23????15?????7????62????54????46????38????30????22????14?????6????61????53????45????37????29????21????13?????5????28????20????12?????4 1.2.2??把變換后的密鑰等分成兩部分,前28位記為C[0], 后28位記為D[0]. 1.2.3??計(jì)算子密鑰(共16個(gè))， 從i=1開始。 1.2.3.1 分別對(duì)C[i-1],D[i-1]作循環(huán)左移來(lái)生成C[i],D[i].(共16次)。每次循環(huán)左移位數(shù) ????????如下表所示： 循環(huán)次數(shù)????1????2????3????4????5????6????7????8????9????10????11????12????13????14????15????16 左移位數(shù)????1????1????2????2????2????2????2????2????1?????2?????2?
