macOS Python: Encrypt based on string

[lynkynpark86]

Is there a way to encrypt/decrypt a string based on string 'x'? I would do:

theString = rawInput('Enter your message: ')
theKey = rawInput('Enter your password: ')
theEncryptedString = encrypt(theString, theKey)
print "Your encrypted string is %s" % (theEncryptedString)

Something like that. Any ideas?

 

[naples98]

It all depends on how secure you want it to be. You could simply do something like

Convert String1 to Integer1
Convert String2 to Integer2
Multiply Integer1*Integer2 = Integer3
Convert Integer3 to String3

String3 is your encrypted string and you reverse the process to get your original string back.

 

[jiminaus]

As mentioned in http://docs.python.org/library/crypto.html, perhaps try https://www.dlitz.net/software/pycrypto/.

 

[subsonix]

If this is just for fun, try to encrypt it based on xor with the advantage that the key can be used to get back to the original message. Google for a python version, here is one in C.

char *encrypt(char *theString, char *theKey) {

    size_t stringLength = strlen(theString);
    size_t keyLength = strlen(theKey);

    for(size_t i = 0; i < stringLength; i++) {
        theString[i] = theString[i] ^ theKey[ i % keyLength ];
    }

    return theString;
}

If the key is the same length as the message, you have a one time pad btw. But still, for anything serious, use an appropriate library.