Question

只需要我的代码建议，我现在有我的代码，以便它可以工作，只需将ASCII值加5，但我需要知道的是我怎样才能使这个工作只需移动5沿着字母表的地方，例如现在，如果我要输入Z，我会得到一个_，当我想得到一个D.

Ceaser Cipher

bLoopProgram = True 
while bLoopProgram == True: 

    sEncryptOrDecrypt = input("Encrypt Or Decrypt : ").lower() 
    if sEncryptOrDecrypt == "encrypt": 

        while sEncryptOrDecrypt == "encrypt": 

            sPassNonEnc = input("Enter a password to encrypt : ") 
            aPass = [] 
            for i in range(0, len(sPassNonEnc)): 

                nASCII_VALUE = ord(sPassNonEnc[i]) 

                if nASCII_VALUE < 64: 

                    nASCII_VALUE += 10 

                    aPass.append(chr(nASCII_VALUE)) 

                elif nASCII_VALUE > 63: 

                    nASCII_VALUE -= 10 

                    aPass.append(chr(nASCII_VALUE)) 

                else:
                    print("\n * Unknown Character [ASCII INDEX]")

                    aPass.append()

            print("".join(aPass))

            sSaveToTxt = input("Would you like to save your encrypted password to a text document?\nThe Text document will be found next to this python file and called password_enc (Yes/no): ").lower()
            if sSaveToTxt == "yes":
                fFileRequestedOpen = open('password_enc.txt', 'w')
                fFileRequestedOpen.write("".join(aPass))
                fFileRequestedOpen.close()
                print("Saved to text document have a nice day!")
                break

            elif sSaveToTxt == "no":
                print("okay have a nice day!")
                break

            else:
                print("\n*Invalid Option*\n")


    if sEncryptOrDecrypt == "decrypt":

        while sEncryptOrDecrypt == "decrypt":
            sReadOrInput = input("Would you like to load password from text document if saved,\n or would you like to input a encypted password (read/enter): ").lower()
            if sReadOrInput == "read":               
                fFileRequestedOpen = open('password_enc.txt', 'r')
                sPassEnc = fFileRequestedOpen.read()
                fFileRequestedOpen.close()
                aPass = []
                for i in range(0, len(sPassEnc)):

                    nASCII_VALUE = ord(sPassEnc[i])

                    if nASCII_VALUE < 64:

                        nASCII_VALUE -= 10

                        aPass.append(chr(nASCII_VALUE))

                    elif nASCII_VALUE > 63:

                        nASCII_VALUE += 10

                        aPass.append(chr(nASCII_VALUE))

                    else:
                        print("\n * Unknown Character [ASCII INDEX]")

                print("".join(aPass))
                break
            if sReadOrInput == "enter":
                sPassEnc = input("Enter a password to decrypt : ")
                aPass = []
                for i in range(0, len(sPassEnc)):

                    nASCII_VALUE = ord(sPassEnc[i])

                    if nASCII_VALUE < 64:

                        nASCII_VALUE -= 10

                        aPass.append(chr(nASCII_VALUE))

                    elif nASCII_VALUE > 63:

                        nASCII_VALUE += 10

                        aPass.append(chr(nASCII_VALUE))

                    else:
                        print("\n * Unknown Character [ASCII INDEX]")

                print("The now unencrypted password is:")
                print("".join(aPass))
                break

    elif sEncryptOrDecrypt == "quit":
        quit()

    else:
        print("")

Answer 1

您必须使用modulo（％）将值限制在65（A）和90（Z）

之内

例如：

nASCII_VALUE = 90  # This is a Z
nASCII_VALUE += 5  # chr(95) = _
print(chr(((nASCII_VALUE - 64) % 26) + 64))

这将打印＆＃39; E＆＃39; （alphabeth的第5个字母）

Python凯撒密码仅限A-Z资本

Ceaser Cipher

1 个答案: