DES加密算法的一般描述 。海养k水 1950 64-bit plaintext 64-bit key Initial Permutatin Permuted Chaice I 64 56 Round 1 K148 55 Permuted Choice 2 Left circular shift 64 6 48 Round 2 K2 Permuted Choice 2 Left circular shift Round 16 K1648 56 Permuted Choice 2 Left circular shilt 32-bit Swap a Inverse Initial Permutation 64.bit ciphertext 道置道品 2022/10/9 12/35 Figure 3.4 General Depiction of DES Encryption Algorithm
2022/10/9 Cryptography and Network Security - 3 12/35 DES加密算法的一般描述
初始置换IP(Initial Permutation)和逆置换IP-1 15 Table 3.2 Permutation Tables for DES (a)Initial Permutation (IP) 5 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 1 53 45 37 29 21 13 5 63 55 47 39 31 23 15 7 (b)Inverse Initial Permutation (IP-1) 40 8 48 16 56 24 64 32 39 7 47 15 55 23 63 31 3 6 46 14 54 22 62 30 37 5 45 13 53 21 61 36 4 44 12 52 20 60 35 3 43 11 51 19 59 34 2 42 10 50 18 58 33 1 41 9 49 17 57 7265.5 2022/10/9 Cryptography and Network Security-3 13/35
2022/10/9 Cryptography and Network Security - 3 13/35 初始置换IP (Initial Permutation)和逆置换IP-1