---
description: Hybrid ML-KEM protects appliance traffic against harvest-now, decrypt-later attacks
title: Post-quantum encryption support for Cloudflare One Appliance
image: https://developers.cloudflare.com/changelog/post/2026-02-11-appliance-post-quantum-encryption/og.png?v=999e417c1e52d767
---

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February 11, 2026

## Post-quantum encryption support for Cloudflare One Appliance

[Cloudflare One Appliance](https://developers.cloudflare.com/cloudflare-wan/configuration/appliance/) [Cloudflare One](https://developers.cloudflare.com/cloudflare-one/) [Cloudflare WAN](https://developers.cloudflare.com/cloudflare-wan/)

Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/changelog/post/2026-02-11-appliance-post-quantum-encryption/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

Cloudflare One Appliance version 2026.2.0 adds [post-quantum encryption](https://developers.cloudflare.com/ssl/post-quantum-cryptography/) support using hybrid ML-KEM (Module-Lattice-Based Key-Encapsulation Mechanism).

The appliance now uses TLS 1.3 with hybrid ML-KEM for its connection to the Cloudflare edge. During the TLS handshake, the appliance and the edge share a symmetric secret over the TLS connection and inject it into the ESP layer of IPsec. This protects IPsec data plane traffic against harvest-now, decrypt-later attacks.

This upgrade deploys automatically to all appliances during their configured interrupt windows with no manual action required.

For more information, refer to [Cloudflare One Appliance](https://developers.cloudflare.com/cloudflare-wan/configuration/appliance/).

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