22、简单替换密码编程与破解

简单替换密码编程与破解

1. translateMessage() 函数

translateMessage() 函数用于加密和解密。以下是其代码实现：

def translateMessage(key, message, mode):
    translated = ''
    charsA = LETTERS
    charsB = key
    if mode == 'decrypt':
        # For decrypting, we can use the same code as encrypting. We
        # just need to swap where the key and LETTERS strings are used.
        charsA, charsB = charsB, charsA
    # Loop through each symbol in the message:
    for symbol in message:
        if symbol.upper() in charsA:
            # Encrypt/decrypt the symbol:
            symIndex = charsA.find(symbol.upper())
            if symbol.isupper():
                translated += charsB[symIndex].upper()
            else: