Coming Soon: Kyber (ML-KEM) Hybridized with X25519 in wolfSSH

One of our most popular products is wolfSSH and for good reason; the SSH protocol is commonly used by industry, academia and governments. Efforts are underway in the community to bring post-quantum key exchange algorithms to the SSH protocol to protect your communications against “harvest now, decrypt later” attacks. But we can’t just switch over, we also have to consider compliance. That is why we started supporting ECDHE-P256 hybridized with Kyber at NIST Level 1 KEX as specified by the IETF in ‘Post-quantum Hybrid Key Exchange in SSH.’ This allows for both post-quantum protection as well FIPS-140 compliance.

We have just finished integrating X25519 support into wolfSSH. Our next logical step would be to bring in X25519 hybridized with Kyber at NIST Level 1 KEX as specified in the draft above.

Do you have X25519 requirements but are also thinking about post-quantum protection? Excited to see this happen? Want us to raise the priority of this work? Let us know by sending us a message at!!

If you have questions about any of the above, please contact us at or call us at +1 425 245 8247.

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