GPG-encrypted free-form file (though it's fairly structured), edited via vim and a well-known "auto-encrypt/decrypt GPG files" configuration: http://vim.wikia.com/wiki/Encryption
(Actually, from that page, vim now has built-in blowfish encryption, which I'll have to look at -- yet another argument in favor of sharing tips on the 'TarTubes: you may learn something even when you're sharing your own knowledge).
(Actually, from that page, vim now has built-in blowfish encryption, which I'll have to look at -- yet another argument in favor of sharing tips on the 'TarTubes: you may learn something even when you're sharing your own knowledge).