---
title: "Olm & Megolm"
weight: 61
type: docs
---

The Olm and Megolm cryptographic ratchets are not formally part
of the Matrix specification. In lack of a better place, their
specification is reproduced here, regardless.

-   [Olm: A Cryptographic Ratchet](/olm-megolm/olm/)
-   [Megolm group ratchet](/olm-megolm/megolm/)