OMEMO (Open Multi-Ended Messaging Over) is an open protocol for secure messaging that provides forward secrecy and multiple device support. It is an extension of the Extensible Messaging and Presence Protocol (XMPP) that provides end-to-end encryption for instant messaging and group chat.

OMEMO uses the Double Ratchet Algorithm, which is a variant of the Diffie-Hellman key exchange, to establish a shared secret between the sender and recipient of a message. This shared secret is used to encrypt and decrypt messages using AES in Galois/Counter Mode (AES-GCM). OMEMO also provides support for multiple devices per user, allowing a user to use the same account on multiple devices and receive messages on all of them.

OMEMO is implemented in a number of messaging applications, including Conversations, Gajim, and Pidgin. It is designed to be an alternative to the Signal Protocol, which is used by the Signal messaging app.

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