The only secure method of communication is analogue tooting in your own morse code dialect from inside a soundproof booth. Be sure that yourself and the person you're communicating with are both naked and not bugged by electronics or anything. If funds are tight, you can use an elevator

@Shrigglepuss first step of securing the server is disconnecting it from the internet
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Octodon

Octodon is a nice general purpose instance. more