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Charl is a pair of programs (client and server) which work together as a simple and secure medium of communication. I wrote it with LAN in mind, but it functions fine over the internet (although more convenient alternatives exist there). All traffic between the Charl server and client is encrypted and authenticated using crypto provided by NaCl and libsodium. Users can join channels locked with passwords to have private conversations on it.

User Manual

• Client
• Server