Evaluate the real risks
Encryption will disguise the content of the data. It does not disguise the fact that the data is being transmitted from A to B. If the authorities know who you are, and know that you have stolen data from the NSA or some other TLA, encrypting it isn't actually going to help you at all. They know what the data contains, as it is their data anyway, so whether it is a 400GB blob of apparently random digits, or the entire thing in clear text, it makes no difference. What they want to know is where it is going to, and that is what you need to hide. GnuPG may well be completely uncrackable, but it doesn't matter, because it is hiding the wrong thing.