I want to write on paper more often, but one thing that keeps me from doing that is the feeling of a loss of privacy. I encrypt my notes on the computer. I like knowing that no one can read it - now or even when I am dead. Any suggestions?
Also: If your papers are taken, you probably can figure it out.
At the nation state level... honestly, they'll read it straight off your montior's emissions. TEMPEST exists for a reason.
For these reasons, I tend to NOT trust my computer for absolutely critical things. I prefer paper.
Also remember yesterday's unbreakable crypto is 10 year's from now's breakable and 20 years from now they'll be doing class projects on it in college.
The "look over your shoulder" attack is omni-present. (Also easier to prevent with paper, in general, than with a larger computer screen.)
A simple safe will stop most prying people. And if you die... Well, you are dead... there ain't much stopping anyone at that point.
Keeping secrets is hard. Very hard. There's a reason for the most part... I don't bother, except if/when I need to, and even then, if they can be timed out, all the better.
Paper also has a big benefit in that we know how to destroy it. :)
... Simple things are often best. Understanding how your system will bend/break is critical in security situations.
For these purposes, written journals or letters can be opened opportunistically if found. If I had a safe, it would be opened after my death. If the documents are known to exist in the clear anywhere, then they're subject to probate.
But if they're encrypted and the secret is unknown and hard to guess, then most likely everyone gives up and that's the end of that.
In the end, a computer may be a bit safer. But if it is high enough value... someone will find a way.
(Unfortunately Remarkable doesn't support device encryption, so it's not an option: https://support.remarkable.com/s/article/Does-reMarkable-off...)
If you lose your onenote encryption key, your data is lost forever.
Another solution is Apple Notes with Advanced Data Protection turned on for your Apple ID. That encrypts your entire iCloud Drive with your encryption key and again if you lose your key data is gone; although there are some recovery options which require a trusted contact.
2. Burn notes periodically
3. Accept that they may be read at some point, and write anyways