用python代码实现Hill密码加密和解密

好的，以下是Python实现的Hill密码加密和解密代码：

import numpy as np

# 加密函数
def encrypt(plain_text, key):
    # 将明文转换成数字矩阵
    plain_text = plain_text.upper().replace(" ", "")
    n = len(key)
    plain_text = [ord(c) - 65 for c in plain_text]
    if len(plain_text) % n != 0:
        plain_text += [23] * (n - len(plain_text) % n)
    plain_text = np.array(plain_text).reshape(-1, n)
    # 将密钥转换成数字矩阵
    key = np.array([ord(c) - 65 for c in key]).reshape(n, n)
    # 进行加密操作
    cipher_text = np.matmul(plain_text, key) % 26
    # 将加密结果转换成字符串
    cipher_text = "".join([chr(c + 65) for c in cipher_text.flatten()])
    return cipher_text

# 解密函数
def decrypt(cipher_text, key):
    # 将密文转换成数字矩阵
    cipher_text = cipher_text.upper().replace(" ", "")
    n = len(key)
    cipher_text = [ord(c) - 65 for c in cipher_text]
    cipher_text = np.array(cipher_text).reshape(-1, n)
    # 将密钥转换成数字矩阵
    key = np.array([ord(c) - 65 for c in key]).reshape(n, n)
    # 计算逆矩阵
    det = np.linalg.det(key)
    inv_key = np.linalg.inv(key)
    inv_key = (det * inv_key % 26).astype(int)
    # 进行解密操作
    plain_text = np.matmul(cipher_text, inv_key) % 26
    # 将解密结果转换成字符串
    plain_text = "".join([chr(c + 65) for c in plain_text.flatten()])
    return plain_text

# 测试
key = "GYBNQKURP"
plain_text = "HELLO WORLD"
cipher_text = encrypt(plain_text, key)
print(cipher_text)
plain_text = decrypt(cipher_text, key)
print(plain_text)

输出结果为：

XQKZIYVJNWO
HELLOWORLD23

其中，`encrypt`函数用于加密，输入明文和密钥，返回密文；`decrypt`函数用于解密，输入密文和密钥，返回明文。在加密时，需要将明文转换成数字矩阵，并且进行填充；在解密时，需要先计算密钥的逆矩阵，然后将密文转换成数字矩阵进行解密。