python - 维吉尼亚密码 Python 给出外文字符而不是英语

Question

此代码旨在使用维吉尼亚密码技术进行加密和解密，当我选择加密并输入关键字和文本时，结果是一堆外来字符一次打印在单独的行上，如下所示: L 洛 卢等.此外，当我选择解密时，打印结果是一个错误，指出“打印索引超出范围”。这两个错误我不知道如何解决，任何帮助我将不胜感激。

#encryption 
def encrypt():
    crypt = ''
    key_phrase = raw_input("Please enter a key phrase to encrypt by: ")
    key_text = raw_input("Please enter a piece of text to encrypt: ")
    if len(key_text) == 0: 
        print("Key must be of length 1 or more."); exit()
    if not key_text.isalpha() or not key_phrase.isalpha():
        print("Both text and key must be composed of letters only."); exit()
    for letters in range(0, len(key_text)):
        new = ord(key_text[letters]) + ord(key_text[letters%len(key_text)]) - 65
        if new > 90:
            new -= 26
        crypt += chr(new)
        print crypt

#decryption
def decrypt():
    decrypt = ''
    _key_phrase = raw_input("Please enter a key phrase to decrypt by: ")
    _key_text = raw_input("Please enter a piece of text to include: ")
    if len(_key_text) == 0: 
        print("Key must be of length 1 or more."); exit()
    if not _key_text.isalpha() or not _key_phrase.isalpha():
        print("Both text and key must be composed of letters only."); exit()
    for letters in range(0, len(_key_text)):
        new = ord(_key_phrase[letters]) - ord(_key_text[letters%len(_key_text)]) + 65
        if new < 65:
            new += 26
        decrypt == chr(new)
        print decrypt

#asking the user to enter a or b for en/decryption
choice = raw_input("Please enter either 'a' for encryption or 'b' for     decryption: ")
if choice == 'a':
    print encrypt()
else:
    print decrypt()     

Answer 1

您使用大写 ASCII 代码，但 key 和文本采用小写。

可能的解决方案:

1. 输入时按键和文本使用大写。

2. 通过 key_phrase = key_phrase.upper() 将键和文本设置为大写

3. 小写字母使用 ASCII 代码，大写字母不使用 ASCII 代码。例如范围是 97 到 122，而不是 65 到 90。

这会起作用(尽管这不是最好的解决方案):

在加密中:

key_phrase = raw_input("Please enter a key phrase to encrypt by: ")
key_phrase = key_phrase.upper()
key_text = raw_input("Please enter a piece of text to encrypt: ")
key_text = key_text.upper()

在解密中:

_key_phrase = raw_input("Please enter a key phrase to decrypt by: ")
_key_phrase = _key_phrase.upper()
_key_text = raw_input("Please enter a piece of text to include: ")
_key_text = _key_text.upper()