pycharm代码改进 hill密码随机输入一段明文加密或者密文解密

以下是改进后的 Hill 密码加密和解密代码：

import numpy as np

# 加密函数
def hill_encrypt(plain_text, key):
    # 将明文转换成数字向量
    plain_text = [ord(c) - ord('a') for c in plain_text.lower() if c.isalpha()]
    plain_text = np.array(plain_text)
    # 将密钥转换成矩阵
    key = np.array(key)
    # 将数字向量按照密钥的大小分成若干个块
    block_size = key.shape[0]
    num_blocks = int(np.ceil(len(plain_text) / block_size))
    plain_text = np.pad(plain_text, (0, num_blocks * block_size - len(plain_text)), 'constant')
    plain_text = plain_text.reshape(-1, block_size)
    # 对每个块进行加密
    cipher_text = []
    for block in plain_text:
        cipher_block = np.mod(key @ block, 26)
        cipher_text += cipher_block.tolist()
    # 将密文转换成字符串
    cipher_text = ''.join([chr(c + ord('a')) for c in cipher_text])
    return cipher_text

# 解密函数
def hill_decrypt(cipher_text, key):
    # 将密文转换成数字向量
    cipher_text = [ord(c) - ord('a') for c in cipher_text.lower() if c.isalpha()]
    cipher_text = np.array(cipher_text)
    # 将密钥转换成矩阵
    key = np.array(key)
    # 将数字向量按照密钥的大小分成若干个块
    block_size = key.shape[0]
    num_blocks = int(np.ceil(len(cipher_text) / block_size))
    cipher_text = np.pad(cipher_text, (0, num_blocks * block_size - len(cipher_text)), 'constant')
    cipher_text = cipher_text.reshape(-1, block_size)
    # 对每个块进行解密
    plain_text = []
    for block in cipher_text:
        # 计算矩阵的逆
        det = np.linalg.det(key)
        inv_key = np.mod(np.round(det * np.linalg.inv(key)), 26)
        plain_block = np.mod(inv_key @ block, 26)
        plain_text += plain_block.tolist()
    # 将明文转换成字符串
    plain_text = ''.join([chr(c + ord('a')) for c in plain_text])
    return plain_text

# 生成随机明文
def generate_random_text(length):
    # 生成随机明文
    text = ""
    for i in range(length):
        text += chr(np.random.randint(ord('a'), ord('z') + 1))
    return text

# 生成随机密钥
def generate_random_key(size):
    return np.random.randint(0, 26, (size, size))

# 测试代码
key = generate_random_key(2)
plain_text = generate_random_text(10)
cipher_text = hill_encrypt(plain_text, key)
decrypted_plain_text = hill_decrypt(cipher_text, key)

print("明文：", plain_text)
print("密钥：", key)
print("密文：", cipher_text)
print("解密后明文：", decrypted_plain_text)

改进后的代码增加了随机生成明文和密钥的函数 `generate_random_text` 和 `generate_random_key`，使用了 `np.random.randint` 函数代替了 Python 的 `random` 库，减少了硬编码。同时，函数中还增加了对明文和密文的过滤，只保留字母字符，避免了在加密和解密过程中出现非法字符的问题。