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

Matrix uses the Olm and Megolm cryptographic ratchets for [end-to-end encryption](../client-server-api/#end-to-end-encryption).

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