栅栏密码python代码

栅栏密码（Fence Pattern）是一种简单的加密技术，它将明文按照一定的规则隔行排列形成一个新的矩阵。下面是一个简单的Python代码示例，演示如何创建和解密栅栏密码：

def encrypt(text, rows):
    encrypted_text = [''] * rows
    step = 2 if rows % 2 == 0 else 1
    for i in range(len(text)):
        column = i // step
        encrypted_text[column] += text[i]
    
    return '\n'.join(encrypted_text)

def decrypt(encrypted_text, rows):
    original_text = ''
    step = 2 if rows % 2 == 0 else 1
    lines = encrypted_text.split('\n')
    for line in lines:
        for i in range(0, len(line), step):
            original_text += line[i]
    
    return original_text

# 示例
plaintext = "Hello, World!"
rows = 3  # 根据需求设置行数
encrypted = encrypt(plaintext, rows)
decrypted = decrypt(encrypted, rows)

print("Encrypted Text:")
print(encrypted)
print("\nDecrypted Text:")
print(decrypted)