I'm using org-crypt. All text below a heading with the tag :crypt: becomes encrypted with saving the file and looks like this:
-----BEGIN PGP MESSAGE----- Version: GnuPG v2 hQEOAxn9DjwjX2oYEAQAgLl/58dss1VVgmRb1rGIaNV2I5P+smcDjhWa5/arTMPE 9wjxHUpU/HSflCwnV5609H3J9ZSVubCpaUbV3Da0jnDUJuljFbSqapRym1PW0hFn ApfLwze3HTj+A3eODf+p3kbDjFnII9Rfn7lWQ/6OmMrisQbvbsWzS3K/crgqu+cD /j6m3nDURonKGStv5h7sgaSRuLGzqXvHXEnS+d1ad1ZomgTD4abZNvDYt9Y039FE xYwRphWSBs+vtQ34resZewCa4s7h5SES5j839vQPWI4VyA4uRrfzYATHnHtoxfwA RQWzUTeS16FFBxnjqqTXGXqH9go25Ovnl1Np9c2H7veH0lQB/hpwGbUJRnYCx5Nd UlZ/U+aKQJl3aD+ulgOxJhTQNb9ToXxMpwS3FitsZHVh8OaRBLdgjRVFstWw3NhT RTQ3Og0+ts34iKW+u+2ock/LqiDYFx4= =+xma -----END PGP MESSAGE----- I really hope this example will not irritate your email software. My notebook has one of those large touchpads and once in a while I hit it and go on with typing, but the cursor shifted to text somewhere else and I'm adding letters to a completely different paragraph, before I notice and correct it. Well, this evening I added some letters inadvertently inside a PGP message, because the touchpad shifted to cursor to an encrypted paragraph. If I saved the file, the encrypted paragraph would have become un-decryptable (I tested this: decrypting no longer is possible). Unfortunately I won't always realise what happened, e.g. if I don't watch while dictating into a speech recognition (Dragon Nat. Speak.). And the encrypted parts are not needed often. So the destroyed PGP message might make it into my backups and if I try to encrypt it a year later... Why isn't the text between -----BEGIN PGP MESSAGE----- and -----END PGP MESSAGE----- read-only as a default ? Really, an inadvertent change can destroy valuable information and it i