【文章內(nèi)容簡(jiǎn)介】 bit 串； ⑥對(duì)任何 S盒，當(dāng)它的任一輸入位保持不變，其他 5 位輸入變化時(shí)，輸出數(shù)字中的0 和 1 的總數(shù)接近相等。 （ 5） DES的攻擊方法 目前攻擊 DES的主要方法有差分攻擊、線性攻擊和相關(guān)性密鑰攻擊等方法，在這些攻擊方法中，線性攻擊方法是最有效的一種方法。 C 語(yǔ)言實(shí)現(xiàn) DES 算法 ，頭文件與宏定義 include include include include define PLAIN_FILE_OPEN_ERROR 1 define KEY_FILE_OPEN_ERROR 2 define CIPHER_FILE_OPEN_ERROR 3 define OK 1 typedef Typedef char ElemType。 ，逆初始置換表， S盒等已知數(shù)據(jù)的定義 //初始置換表 IP int IP_Table[64] = { 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, 15 56,48,40,32,24,16,8,0, 58,50,42,34,26,18,10,2, 60,52,44,36,28,20,12,4, 62,54,46,38,30,22,14,6}。 //逆初始置換表 IP1 int IP_1_Table[64] = {39,7,47,15,55,23,63,31, 38,6,46,14,54,22,62,30, 37,5,45,13,53,21,61,29, 36,4,44,12,52,20,60,28, 35,3,43,11,51,19,59,27, 34,2,42,10,50,18,58,26, 33,1,41,9,49,17,57,25, 32,0,40,8,48,16,56,24}。 //擴(kuò)充置換表 E int E_Table[48] = {31,0,1,2,3,4, 3,4,5,6,7,8, 7,8,9,10,11,12, 11,12,13,14,15,16, 15,16,17,18,19,20, 19,20,21,22,23,24, 23,24,25,26,27,28, 27,28,29,30,31,0}。 //置換函數(shù) P int P_Table[32] = {15,6,19,20,28,11,27,16, 0,14,22,25,4,17,30,9, 1,7,23,13,31,26,2,8, 18,12,29,5,21,10,3,24}。 //S盒 int S[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 16 {{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}, {4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14}, {11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3}}, //S6 {{12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11}, {10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8}, {9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6}, {4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13}}, //S7 {{4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1}, {13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6}, {1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2}, {6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12}}, //S8 {{13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7}, {1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2}, {7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8}, {2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11}}}。 //置換選擇 1 int PC_1[56] = {56,48,40,32,24,16,8, 0,57,49,41,33,25,17, 9,1,58,50,42,34,26, 18,10,2,59,51,43,35, 62,54,46,38,30,22,14, 6,61,53,45,37,29,21, 13,5,60,52,44,36,28, 20,12,4,27,19,11,3}。 //置換選擇 2 int PC_2[48] = {13,16,10,23,0,4,2,27, 14,5,20,9,22,18,11,3, 25,7,15,6,26,19,12,1, 40,51,30,36,46,54,29,39, 50,44,32,46,43,48,38,55, 33,52,45,41,49,35,28,31}。 //對(duì)左移次數(shù)的規(guī)定 int MOVE_TIMES[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1}。 17 int ByteToBit(ElemType ch,ElemType bit[8])。 int BitToByte(ElemType bit[8],ElemType *ch)。 int Char8ToBit64(ElemType ch[8],ElemType bit[64])。 int Bit64ToChar8(ElemType bit[64],ElemType ch[8])。 int DES_MakeSubKeys(ElemType key[64],ElemType subKeys[16][48])。 int DES_PC1_Transform(ElemType key[64], ElemType tempbts[56])。 int DES_PC2_Transform(ElemType key[56], ElemType tempbts[48])。 int DES_ROL(ElemType data[56], int time)。 int DES_IP_Transform(ElemType data[64])。 int DES_IP_1_Transform(ElemType data[64])。 int DES_E_Transform(ElemType data[48])。 int DES_P_Transform(ElemType data[32])。 int DES_SBOX(ElemType data[48])。 int DES_XOR(ElemType R[48], ElemType L[48],int count)。 int DES_Swap(ElemType left[32],ElemType right[32])。 int DES_EncryptBlock(ElemType plainBlock[8],ElemType subKeys[16][48],ElemType cipherBlock[8])。 int DES_DecryptBlock(ElemType cipherBlock[8],ElemType subKeys[16][48],ElemType plainBlock[8])。 int DES_Encrypt(char *plainFile, char *keyStr,char *cipherFile)。 int DES_Decrypt(char *cipherFile, char *keyStr,char *plainFile)。 //字節(jié)轉(zhuǎn)換成二進(jìn)制 int ByteToBit(ElemType ch, ElemType bit[8]){ int t。 for(t = 0。t 8。 t++){ *(bit+t) = (cht)amp。1。 } return 0。 } //二進(jìn)制轉(zhuǎn)換成字節(jié) int BitToByte(ElemType bit[8],ElemType *ch){ int t。 for(t = 0。t 8。 t++){ *ch |= *(bit + t)t。 } return 0。 } //將長(zhǎng)度為 8的字