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Two ordinary connections
We connect to the website on port 443, the same way a browser does. No scanning, no attacks, no logins.
Free tool
Is your website ready for post-quantum encryption?
Enter a domain to check whether its HTTPS connection already uses post-quantum key exchange (ML-KEM). It's free, takes a few seconds, and nothing is stored.
Try:
How it works
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A post-quantum test
The first connection offers only hybrid post-quantum key exchange (X25519MLKEM768). If the website accepts it, it is ready. The second connection reads the TLS version and certificate.
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Nothing stored
We don't save the domains you check or the results. Results may be cached for up to 15 minutes to keep the tool fast.
What the result means
A green result is good news, but it covers only one part of an organization's cryptography.
- Ready in transit
The connection to this website is protected against "harvest now, decrypt later" for visitors using a modern browser.
- Not yet
TLS 1.3 is in place, but post-quantum key exchange isn't turned on. Often a configuration or CDN update.
- Outdated
No TLS 1.3. Upgrading TLS is the first step before post-quantum protection is possible.
What this checker can't see: internal systems, APIs, VPNs, databases, backups, certificates and vendors. Those need a full cryptography inventory.
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