title: Simply encrypt a string in C
body: <p>I'm trying to encrypt a query string on a game I'm making when opening a url. It doesn't have to be complicated, in fact since I'm working from a game engine it needs to be as simple as possible. It tends to fuss if I get too low level. </p>
  
  <p>I've already created the query string, I just need to take each char of it and subtract 15 from the char to lightly encrypt it. I'm just wanting to make a simple encryption that will deter most users.</p>
  
  <p><strong>I wish I could give a code example but I'm not too experienced in C, and I'm not even sure where to begin.</strong> The game engine's api usually makes everything simple for me. </p>