Whenever I'm roleplaying with my tinfoil hat, I say that the NSA is behind the "never implement your own crypto" advice.
If you're really worried, roll your own encryption, and then also run the encrypted message through standard encryption implementations. After all, if the standard implementations work, it doesn't matter if you mess up your own crypto implementation, because the standard implementation is unbreakable.
If you're really worried, roll your own encryption, and then also run the encrypted message through standard encryption implementations. After all, if the standard implementations work, it doesn't matter if you mess up your own crypto implementation, because the standard implementation is unbreakable.