What works currently: With emacs25 (as comes with ubuntu 18) I use
ccrypt on the command line to selectively en/decrypt a few specific text files. There is a package
elpa-ps-ccrypt which, on encountering such a file, asks for the password, decrypts and lets me edit the file. On save, it encrypts it.
What's wrong: The package elpa-ps-ccrypt does not work with emacs28 (ubuntu snapshot package) for quite some time. It can decrypt, but when saving I get a lengthy error-message.
What I would like: I guess I should switch. But what is a decent successor?
kaesar mention "openssl", which makes me cringe. But maybe that is what is the right thing to do? Or is it easier to define a save and a load action to transform files on writing and reading? How would that be done with asking the password?