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What is X25519MLKEM768?
The key exchange that starts a TLS connection, X25519 together with ML-KEM-768 (NIST FIPS 203). Traffic recorded today stays safe even if a quantum computer can later break X25519. Chrome, Firefox, Safari and Edge offer it by default.
It covers the connection only. The certificate still uses RSA or ECDSA: no public CA issues post-quantum certificates yet.
Sources: NIST FIPS 203, IETF draft-ietf-tls-ecdhe-mlkem.