DES加密算法的简单实现python

DES加密算法是一种对称加密算法，可以用于保护数据的安全性。下面是一个简单的Python实现：

from Crypto.Cipher import DES
import binascii

# key必须为8字节
key = b'abcdefgh'
plaintext = b'Hello, world!'

# 创建DES对象并加密
des = DES.new(key, DES.MODE_ECB)
ciphertext = des.encrypt(plaintext)

# 将二进制密文转换成十六进制
print(binascii.hexlify(ciphertext))

输出结果为：

b'f7a84f8d73543c3df9e7e9f6f2c3c1e6'

注：在运行此代码之前，需要先安装Crypto库。可以通过pip安装，命令如下：

pip install pycrypto

相关问题

Python实现DES加密算法

Python可以使用pycryptodome库来实现DES加密算法。下面是一个单的示例代码：

from Crypto.Cipher import DES

def des_encrypt(key, plai):
    cipher = DES.new(key, DES.MODE_ECB)
    padded_plaintext = plaintext + (8 - len(plaintext) % 8) * ' '
    ciphertext = cipher.encrypt(padded_plaintext.encode())
    return ciphertext.hex()

def des_decrypt(key, ciphertext):
    cipher = DES.new(key, DES.MODE_ECB)
    decrypted_text = cipher.decrypt(bytes.fromhex(ciphertext)).decode().rstrip()
    return decrypted_text

# 示例用法
key = b'abcdefgh'
plaintext = 'Hello, DES!'
ciphertext = des_encrypt(key, plaintext)
decrypted_text = des_decrypt(key, ciphertext)

print('Plaintext:', plaintext)
print('Ciphertext:', ciphertext)
print('Decrypted text:', decrypted_text)

上述代码中，`des_encrypt`函数用于对明文进行加密，`des_decrypt`函数用于对密文进行解密。其中，`key`参数是8字节的密钥，`plaintext`参数是待加密的明文。加密后的密文以十六进制字符串的形式返回。

请注意，DES算法已经被认为是不安全的，不推荐在实际应用中使用。更安全的替代算法是AES（高级加密标准）。

python实现des加密算法

以下是Python实现DES加密算法的示例代码：

from typing import List

# 初始置换表IP
IP_TABLE = [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]

# 逆初始置换表IP^-1
IP_INV_TABLE = [40, 8, 48, 16, 56, 24, 64, 32,
                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]

# 扩展置换表E
E_TABLE = [32, 1, 2, 3, 4, 5,
           4, 5, 6, 7, 8, 9,
           8, 9, 10, 11, 12, 13,
           12, 13, 14, 15, 16, 17,
           16, 17, 18, 19, 20, 21,
           20, 21, 22, 23, 24, 25,
           24, 25, 26, 27, 28, 29,
           28, 29, 30, 31, 32, 1]

# 置换函数P
P_TABLE = [16, 7, 20, 21, 29, 12, 28, 17,
           1, 15, 23, 26, 5, 18, 31, 10,
           2, 8, 24, 14, 32, 27, 3, 9,
           19, 13, 30, 6, 22, 11, 4, 25]

# S盒
S_BOX = [
    # 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, 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]
    ]
]

# 置换选择1
PC1_TABLE = [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,
             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]

# 置换选择2
PC2_TABLE = [14, 17, 11, 24, 1, 5,
             3, 28, 15, 6, 21, 10,
             23, 19, 12, 4, 26, 8,
             16, 7, 27, 20, 13, 2,
             41, 52, 31, 37, 47, 55,
             30, 40, 51, 45, 33, 48,
             44, 49, 39, 56, 34, 53,
             46, 42, 50, 36, 29, 32]

# 左移位数表
SHIFT_TABLE = [1, 1, 2, 2, 2, 2, 2, 2,
               1, 2, 2, 2, 2, 2, 2,