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Re:Show HN: So.ciety, an end-to-end encrypted social network by dutchbrit on Wednesday December 03, 2014 @10:33AM (#8694210)
AngularJS, Express, Socket.io & MongoDB. However, I'm considering switching over to Postgres.

Encryption wise, I'm using CryptoJS for AES256 and OpenPGP.js for PGP.

All messages get encrypted in AES256 with a randomly created passphrase. The passphrase is then distributed to the recipients using PGP.

Re:Show HN: So.ciety, an end-to-end encrypted social network by Xeoncross on Wednesday December 03, 2014 @02:17PM (#8695759)
If it's a single server then PostgreSQL would certainly give the best performance considering how invasive MongoDB is. However, I'm sure you'll soon grow to multiple servers so that wouldn't be as big of a problem.

Keep MongoDB on it's own server.