diff --git a/README.md b/README.md
index 4de914b..67ce050 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,7 @@ MQTT is a lightweight client-server publish/subscribe messaging protocol, optimi
     - [Misc](#misc)
 - [Visualization, Dashboards](#visualization-dashboards)
 - [Architecture, Convention](#architecture-convention)
+- [Security, Encryption](#security-encryption)
 
 
 ### Community Resources
@@ -339,6 +340,10 @@ Other tools that can be used to create Visualization/Dashboards can be found und
 * [mqtt-smarthome](https://github.com/mqtt-smarthome/mqtt-smarthome) - Smart home automation with MQTT as the central message bus - Architectural proposal.
 * [The Homie Convention](https://github.com/homieiot/convention) - A lightweight MQTT convention for the IoT.
 
+### Security, Encryption
+
+* [Teserakt E4](https://teserakt.io/) - End-to-end encryption for MQTT and other M2M protocols - Commercial solution.
+
 
 ## Contribute