Question

在此任务中，我需要根据给定的密钥对消息进行加密。面临的挑战是将字母的索引编入索引，并进行更改以替换消息中的字母。到目前为止，我的代码是：

def encode(key,plaintext):

    for i in key:
        key.index(i)
    for i in plaintext:
        print(plaintext.index(i))

    alpha = ["abcdefghijklmnopqrstuvwxyz"]




def main():

    plaintextMessages = [
        ["This is the plaintext message.",
         "bcdefghijklmnopqrstuvwxyza"],
        ["Let the Wookiee win!",
         "epqomxuagrdwkhnftjizlcbvys"],
        ["Baseball is 90% mental. The other half is physical.\n\t\t- Yogi Berra",
         "hnftjizlcbvysepqomxuagrdwk"],
        ["I used to think I was indecisive, but now I'm not too sure.",
         "mqncdaigyhkxflujzervptobws"],
        ["Einstein's equation 'e = mc squared' shows that mass and\n\t\tenergy are interchangeable.",
         "bludcmhojaifxrkzenpsgqtywv"] ]

    codedMessages = [
        ["Uijt jt uif dpefe nfttbhf.",
         "bcdefghijklmnopqrstuvwxyza"],
        ["Qnhxgomhqm gi 10% bnjd eho 90% omwlignh. - Zghe Xmy",
         "epqomxuagrdwkhnftjizlcbvys"],
        ["Ulj njxu htgcfj C'gj jgjm mjfjcgjt cx, 'Ep pej jyxj veprx rlhu\n\t\t uljw'mj tpcez jculjm'. - Mcfvw Zjmghcx",
         "hnftjizlcbvysepqomxuagrdwk"],
        ["M 2-wdme uxc yr kylc ua xykd m qxdlcde, qpv wup cul'v gmtd mlw\n\t\t vuj aue yv. - Hdeew Rdyladxc",
         "mqncdaigyhkxflujzervptobws"] ]

    for i in plaintextMessages:
        encode(i[1],i[0])


main()

我可以获得键的索引和消息，但是我对如何使这些东西交互或相互影响感到困惑。

Answer 1

如果键应按数字移动明文（例如b会将其移动2），则ord和chr函数将有所帮助。您可以遍历明文，使用ord查找字母编号，然后将其移动，然后使用chr查找新字母。

例如

keyAscii = ord(key[i]) - 96 #I'm assuming all keys are like the above and lowercase
textAscii = ord(plaintext[i]) + keyAscii

if((textAscii > 90 and < 97) or (textAscii > 122)):   #This part is to keep it as letters
    textAscii -= 26

对于解码编码的消息，您可以执行相反的操作，然后减去ASCII值。

用python加密消息

1 个答案: