---
description: Secure public key distribution in end-to-end encrypted messaging systems.
title: Key Transparency Auditor
image: https://developers.cloudflare.com/og-docs.png
---

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> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/key-transparency/llms.txt  
> Use this file to discover all available pages before exploring further.

# Key Transparency Auditor

Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://mchen-ai-models-sync.previews.developers.cloudflare.com/key-transparency/index.md)|[Agent setup](https://mchen-ai-models-sync.previews.developers.cloudflare.com/agent-setup/)

Secure the distribution of public keys in your end-to-end encrypted (E2EE) messaging systems

Cloudflare's Key Transparency Auditor aims to secure the distribution of public keys for end-to-end encrypted (E2EE) messaging systems like [WhatsApp ↗](https://engineering.fb.com/2023/04/13/security/whatsapp-key-transparency/). It achieves this by building a verifiable append-only data structure called a Log, similar to [Certificate Transparency ↗](https://developer.mozilla.org/en-US/docs/Web/Security/Certificate%5FTransparency).

Cloudflare acts as an auditor of Key Transparency Logs to ensure the transparency of end-to-end encrypted messaging public keys. Cloudflare provides an API for anyone to monitor the verification work we perform, and verify the state of its associated Logs locally.

## Related products

[Certificate Transparency Monitoring](https://mchen-ai-models-sync.previews.developers.cloudflare.com/ssl/edge-certificates/additional-options/certificate-transparency-monitoring/)

Certificate Transparency (CT) Monitoring is an opt-in feature in public beta that aims to improve security by allowing you to double-check any SSL/TLS certificates issued for your domain.

[Privacy Gateway](https://mchen-ai-models-sync.previews.developers.cloudflare.com/privacy-gateway/)

Privacy Gateway is a managed service deployed on Cloudflare's global network that implements part of the [Oblivious HTTP (OHTTP) IETF ↗](https://www.ietf.org/archive/id/draft-thomson-http-oblivious-01.html) standard. The goal of Privacy Gateway and Oblivious HTTP is to hide the client's IP address when interacting with an application backend.

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