You obviously know nothing about cryptography.

With AES and a 256-bit key, that's a brute force that needs to try 2^256 possible keys.

While it is true that weak passwords will screw you over, that can be easily solved by not using an insecure password.

Like the previous commenter said, the feds would never admit to being able to break crypto like AES. If they were doing it, it'd be for the decryption of big-deal interceptions, but that probably won't happen.

If you're really paranoid, use something like Serpent or another AES finalist, because the criteria for choosing Rjindael for AES were a bit questionable.