X25519 Diffie-Hellman key exchange (default). Based on Curve25519 as defined in RFC 7748.
ML-KEM-512 post-quantum key encapsulation (NIST security level 1).
ML-KEM-768 post-quantum key encapsulation (NIST security level 3).
ML-KEM-1024 post-quantum key encapsulation (NIST security level 5).
Available key encapsulation schemes.