>When it comes to file encryption, as far as I'm aware, the most secure
methods of encryption are AES and OpenPGP. But I'm not sure.
gpg -c --cipher-algo AES256 file.txt
That's the command I use. AFAIK AES is very secure.
Also, I can recommend the riseup's website as source of information on
setting up a proper gpg key. Look for "gpg best practices". It involves
placing some changes in the gpg.conf file, nothing complicated though.
You will also find the instructions to check if your current key is set up
properly (giving precedence to the most secure encryption cyphers).
Banana Magique: very nice line.