OMEMO cryptographic audit


A third-party security audit of Armadillo Chat's encryption.

The OMEMO encryption protocol has become the defacto standard for end-to-end encryption among open-source instant messaging clients. OMEMO is an encryption protocol for XMPP (an instant messaging protocol) which is similar to the Axolotl double-ratchet used in Signal.

Armadillo has been involved with OMEMO development for a long time. We funded both it’s development in Conversations (the reference client for OMEMO), as well as a cryptographic audit of the OMEMO protocol.

Both Armadillo Chat and Conversations both use OMEMO to protect messages, files and calls between users.

Here is the audit we organized and created for OMEMO back in 2016, performed by Radically Open Security:


You can download a PDF copy or view the audit below.


  • Published on: Jun 1st, 2016

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