Question

在Python3中，我必须创建两个函数，substitutionEncrypt和substitutionDecrypt。必须修改substitutionEncrypt，以便在加密之前删除纯文本的所有空格，并且它将从密码生成密码密钥。（调用genKeyFromPass）。 psw将key替换为函数头中的参数。

substitutionDecrypt将有两个参数（cipherText，psw）我被给了以下代码。它应该返回原始的plainText并删除空格。

最后，写一个顶级函数，main。 main应该（a）使用Python的内置输入函数来获取要加密的字符串和密码; （b）调用substitutionEncrypt来加密输入字符串; （c）打印substitutionEncrypt返回的值; （d）调用substitutionDecrypt将substitutionEncrypt返回的值转换回纯文本; （e）打印由substitutionDecrypt返回的值。

注意：subEncrypt和subDecrypt需要调用genKeyFromPass，它调用removeDupes和removeMatches。我已经获得了以下代码。

defSubstitutionEncrypt(plainText, key):
    alphabet = "abcdefghijklmnopqrstuvwxyz "
    plainText = plainText.lower()
    cipherText = " "
    for ch in plainText:
        idx = alphabet.find(ch)
        cipherText = cipherText + key[idx]
    return cipherText

def removeDupes(myString):
    newStr = " "
    for ch in myString:
        if ch not in newStr:
            newStr = newStr + ch
    return newStr

def removeMatches(myString, removeString):
        newStr = " "
        for ch in myString:
            if ch not in removeString:
            newStr = newStr + ch
        return newStr

def genKeyFromPass(password):
    key = 'abcdefghijklmnopqrstuvwxyz'
    password = removeDupes(password)
    lastChar = password[-1]
    lastIdx = key.find(lastChar)
    afterString = removeMatches(key[lastIdx+1:], password)
    beforeString = removeMatches(key[:lastIdx], password)
    key = password + afterString + beforeString
    return key

从我创建的代码：

def substitutionEncrypt(plainText, psw):
    alphabet = "abcdefghijklmnopqrstuvwxyz "
    newStr = plainText.lower()
    cipherText = " "
    genKeyFromPass(newStr)
    for ch in newStr:
       idx = alphabet.find(ch)
       cipherText = cipherText + genKeyFromPass(psw)[idx]
    return cipherText.replace(" ","")


def genKeyFromPass(psw):
    key = 'abcdefghijklmnopqrstuvwxyz'
    psw = removeDupes(psw)
    lastChar = psw[-1]
    lastIdx = key.find(lastChar)
    afterString = removeMatches(key[lastIdx+1:], psw)
    beforeString = removeMatches(key[:lastIdx], psw)
    key = psw + afterString + beforeString
    return key 

def removeDupes(myString):
    newStr = " "
    for ch in myString:
        if ch not in newStr:
            newStr = newStr + ch
    return newStr

def removeMatches(myString, removeString):
    newStr = " "
    for ch in myString:
    if ch not in removeString:
        newStr = newStr + ch
    return newStr



 print(substitutionEncrypt('the quick brown fox', 'ajax'))

我得到＆＃34; nukobjdualhqguyhr＆＃34;作为输出。输出示例如下：

subEncrypt（＆＃39;快速的棕色狐狸＆＃39;，＆＃39; ajax＆＃39;）

＆＃39; qdznrexgjoltkblu＆＃39;

subDecrypt（＆＃39; qdznrexgjoltkblu＆＃39;，＆＃39; ajax＆＃39;）

＆＃39; thequickbrownfox＆＃39;

我的代码出了什么问题？我一直无法从另一个函数调用一个值（从genKeyFromPass调用键）。它在substitutionEncrypt中返回语句之前的行。另外，我将如何进行substitutionDecrypt？我已经走到了这一步：

def substitutionDecrypt(cipherText, psw):
    alphabet = 'abcdefghijklmnopqrstuvwxyz'
    newStr = cipherText.lower()
    plainText = " "
    genKeyFromPass(cipherText)
    for ch in cipherText:
        idx = alphabet.find(ch)
    return plainText.replace(" ","")

如何加密和解密？

0 个答案: