Obscurity should never be your only security measure, but it can still play an important role in your overall security strategy. You can and should encrypt anything you're hiding with steganography.

Also, steganography isn't really security through obscurity. That phrase generally refers to things like trying to keep a weak encryption algorithm secret because anyone who knows the algorithm has a huge head start on cracking it. Good crypto algorithms are designed to be secure even when an attacker knows exactly which algorithm was used.