Profanity is an open-source instant messaging client designed for secure communication. It's a self-hosted solution, meaning you can run it on your own server or a cloud service.
Profanity is built on top of the Matrix protocol, which allows for decentralized communication. This means you can communicate with anyone who also uses a Matrix-compatible client, regardless of the platform they're on.
One of the key benefits of Profanity is its end-to-end encryption. This ensures that only the sender and the intended recipient can read the messages, keeping your conversations private.
Additional reading: End of Message
Encryption
Profanity supports various kinds of encryption, but you can only enable one per correspondent at a time.
OMEMO is a popular encryption option that uses the Signal protocol for key management and message synchronization. It works even when other clients are offline and offers Perfect Forward Secrecy and Plausible deniability.
OTR, on the other hand, uses a combination of AES, Diffie-Hellman key exchange, and SHA-1 hash function. It offers deniable authentication and Perfect Forward Secrecy, but requires both clients to be online at the same time for initialization.
OpenPGP, also known as Legacy OpenPGP, has been deprecated and doesn't provide protection against replay attacks. It's still mentioned for historical context.
OX is a more modern way to use OpenPGP on XMPP, but it doesn't support MUCs and file transfer via HTTP upload.
Current Client
Profanity is a console based instant messaging client for XMPP (Jabber) protocol based chat.
The client is inspired by the popular IRC client IRSSI, giving it a familiar feel for users.
Profanity is implemented in C and has a graphical user interface, making it easy to use.
Profanity works with XMPP and can be used for chatting, making it a great option for those who want a simple and efficient way to communicate.
Profanity is available on Linux and can be run in text-mode or with a graphical user interface.
A current client for Profanity is available, but it's not always easy to find the necessary dependencies.
A user on linuxquestions.org created a Slackbuild for the missing dependency, but it's not publicly available.
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