In this post we consider a simple method to check if TLS/SSH servers have post quantum or hybrid encryptions.

Hybrid encryption combines classical and post-quantum (PQC) cryptography to offer a secure transition to a future with quantum computers, while post-quantum cryptography focuses on developing new algorithms resistant to quantum attacks

We go to this URL: https://0602208.xyz/tools/pq_scan/pq_scan.html and enter the required site/url.

According to searches on internet, proton.me is considered as the most secure email provider with mail.tutanota.com the second most secure email provider. Let us check, if they have post quantum or hybrid encryptions on TLS servers. First, let us try proton.me.

After clicking on the “Scan!” button we get negative results.

Let us try gmail.com.

After clicking on the “Scan!” button we get a positive result -hybrid encryption.

Now, we try http://mail.tutanota.com.

The result is negative for this email provider.

Conclusion

Among most popular secure email providers, only gmail.com has hybrid encryption, therefore proton.me and mail.tutanota.com are not ready for the coming era of quantum computers, but gmail.com is ready.