Caesar密码加密Python

Question

有人能告诉我为什么我的纯文本消息中只有一个字符需要加密吗？消息是“船在午夜启航”，加密密钥是4。我只能将t转换为x，消息的其余部分不打印。我遗漏了什么？

#request the message from the user
def InputMessage():
    PlainText = input("Enter the message you would like to encrypt: ")
    return PlainText

#encrypt the message
def CaesarShift(PlainText):

    #initialize variables
    alpha = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z']
    Key = int(input("Enter the encryption key: "))
    CipherText = ""

    #skip over spaces in the message
    for ch in PlainText:
        if ch == " ":
            pass
        else:

            #encrypt the message 
            index = alpha.index(ch)
            NewIndex = index + Key
            ShiftedCharacter = alpha[NewIndex]
            CipherText += ShiftedCharacter
        return CipherText


#main program start
def main():
    PlainText = InputMessage()
    CipherText = CaesarShift(PlainText)

    #print the encrypted message
    print("Encrypted message: " + CipherText)

#main program end
main()

Answer 1

您的return语句在循环中，因此该函数仅在加密第一个字母后返回。

您需要确保return语句的缩进级别与for循环的缩进级别相同。