This feels weird to me. If your password is “ILikePotato”, which is then used to decrypt a text file that contains “IStoleTheMonaLisaAndReplacedItWithAPhotocopy”, how is that any different in terms of “incriminating yourself” than if it was the other way around…?
And if you actually forgot your password, that’s 3 months jail for you, because they’ll hardly believe you? Better have just one so you’ll surely remember!
I wonder, if you use special markings to keep track of your illegal doings, and one of your notebooks is found during a search, are you required to assist in deciphering the contents of it? That’s basically the same thing as decrypting your hard drive.