Am I Quantum Safe?

Updated 19 November 2024.

Web Browsers

To understand if your current browser implements Post Quantum Cryptography (PQC) and is quantum safe, visit this Cloudflare page. You should hopefully see a message like “You are using X25519MLKEM768 which is post-quantum secure” or “You are using X25519Kyber768Draft00 which is post-quantum secure” (if the browser uses a pre-standards version of PQC). Note that you are secure only if the other end also implements PQC as well.

If you aren’t seeing that message, you may need to turn on the PQC feature in your browser. Evertrust has some instructions on how to do this.

Not every browser supports it right now, but the minimum versions that I’m aware of with support are:

  • Google Chrome – pre-standards support from v116, and standards-compliant support from v131.
  • Brave – pre-standards support from v1.57, and standards-compliant support from v1.73. (Based on Chromium versions aligned to Google Chrome above.)
  • Microsoft Edge – pre-standards support from v124, standards-compliant support from v131.
  • Mozilla Firefox – pre-standards support from v124, standards-compliant support from v132.
  • Opera – pre-standards support from v102. (Based on Chromium versions aligned to Google Chrome above.)

I am not aware of Apple Safari supporting PQC.

Applications

A number of applications have announced that they are quantum safe, these include:

Note that, for messaging applications, generally all parties to a conversation need to have the supported version of the application for any party to be quantum safe.

Please let me know if there are common applications that support PQC that I should add to this list.