For the UK I don’t believe there is anything that force developers of encryption software to have a ‘backdoor’ I could be wrong and if I am point me to the fact.

There is a law in the UK though that allows authorities to jail you for up to 5 years for not giving the pass key to an encrypted object.

As for super computer decrypting a password, that would still take a long time. Super computer would still have to use a brute force to open the file assuming it didn’t get lucky and land to the correct combination and will run typically at 1,000,000,000 passwords a second.

The best password are ones made of all character of the keyboard, Upper and lower case letters, number and non alphanumeric characters e.g % ~

As an example, and taking a password for all available key strokes an 8 digit password (e.g. Has$^39K) give out a 7.2 Quadrillion possible combination taking the super computer a little over 80 days to force.

If you want to give the super computer a run for its money, make the password long and use all characters.

Unless your disk is hosting some seriously bad stuff, the disk will most likely never see a super computer, you just aren’t that important