There's maybe something hidden in the loch.
Loch is a simple utility to encrypt and decrypt files using NaCL's secretbox
Encrypting a file:
$ loch --out source_file.encrypted encrypt source_file
Decrypting a file:
$ loch --out source_file.decrypted decrypt source_file.encrypted
You can provide a text file containing the secret (instead of typing it out in the console) by using the key flag.