String obfuscation using C++ standard ibrary

Question

I want to obfuscate some string data stored locally on iOS/Android device. Something similar to a high score in a game. My goal is to thwart only the laziest people, so encrypting the data really isn't necessary. What does the C++ Standard Library provide that can help?

I looked briefly at cryptopp.com and libtomcrypt but I think they're overkill for what I want to achieve.

Do a Caesar cipher you just need to modify each character by a fixed amount.... — jsantander
– jsantander, Commented Jun 6, 2014 at 17:51
Monoalphabetic ciphers, like the Caesar/additive cipher suggested by jsantander, are both very simple and easily broken. To add a little to the challenge, you might consider an affine cipher or Vigenere cipher. These are all very quick to implement. — Homar
– Homar, Commented Jun 6, 2014 at 18:09

Baum mit Augen · Accepted Answer · 2014-06-06 18:09:20Z

Assuming the string to be "encrypted" is not terribly long, you can use a XOR cipher.

Generate a random string with the same length as your input string and xor your input with it to encrypt and decrypt.

void xor_strings (string& message, const string& key) { for (size_t i = 0; i < message.size(); ++i) message[i] ^= key[i]; }

If you save both strings in your file, it will just contain two random strings.

superreeen · Accepted Answer · 2020-04-10 13:24:05Z

For your requirement you can use the string encryption offered by antispy C/C++ Obfuscation Library for all platforms.

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