Python凯撒密码解码

Question

我是 Python 的新手，决定制作我自己的凯撒密码加密器。我做了加密器，还可以，但是，解密器只能成功解密一个单词。如果我输入一个句子，它会将所有解密合并在一起。有解决此问题的简单方法吗？

def decrypt():
    ciphertext = raw_input('Please enter your Encrypted sentence here:')
    shift = input('Please enter its shift value: ')
    space = []

    cipher_ords = [ord(x) for x in ciphertext]
    plaintext_ords = [o - shift for o in cipher_ords]
    plaintext_chars = [chr(i) for i in plaintext_ords]
    plaintext = ''.join(plaintext_chars)
    print 'Decryption Successful'
    print "" 
    print 'Your encrypted sentence is:', plaintext

decrypt()

Answer 1

我的建议是在每个空格处拆分您的 raw_input()，遍历拆分输入中的每个单词，然后将句子与空格重新连接在一起。这似乎是我能想到的最规范的解决方案:

def decrypt():
    ciphertext = raw_input('Please enter your Encrypted sentence here:')
    shift = int(raw_input('Please enter its shift value: '))
    space = []

    # creat a list of encrypted words.
    ciphertext = ciphertext.split()

    # creat a list to hold decrypted words.
    sentence = []

    for word in ciphertext:
        cipher_ords = [ord(x) for x in word]
        plaintext_ords = [o - shift for o in cipher_ords]
        plaintext_chars = [chr(i) for i in plaintext_ords]
        plaintext = ''.join(plaintext_chars)
        sentence.append(plaintext)

    # join each word in the sentence list back together by a space.
    sentence = ' '.join(sentence)
    print 'Decryption Successful\n'
    print 'Your encrypted sentence is:', sentence

decrypt()

输出:

Please enter your Encrypted sentence here: lipps xlivi
Please enter its shift value:  4
Decryption Successful

Your encrypted sentence is: hello there

注意事项:

• 永远不要只在 Python 2.x 中执行 input()，因为它隐含地使用了 eval() - 这可能非常危险。请改用 int(raw_input())。
• 我删除了您必须创建新行的额外打印语句。而是在您的第二个打印语句中附加一个新行。