The most important thing that every software developer needs to know about security is just remember that "bad" guys are out there. I've seen many cases when pe

The most important thing that every software developer needs to know about security is just remember that "bad" guys are out there. I've seen many cases when people make bad security decision simply assuming that it is just fine and nobody cares. Having a little paranoia as a software developer will help you to write better code (not only from security perspective).