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Key Exchange Method
Combined Elliptic-Curve and Post-Quantum 1 (CECPQ1)
The combined elliptic-curve and post-quantum 1 is a post-quantum cryptography key exchange algorithm developed by Google, LLC to resist against quantum computing attacks. The Transport Layer Security combines X25519, based on elliptic curve Curve25519, and NewHope Elliptic-curve Diffie–Hellman algorithms. It provides forward secrecy, and does protect past sessions against future compromises. If long-term secret keys or passwords are compromised, encrypted communications and sessions recorded in the past cannot be retrieved and decrypted.
Always prefer cipher suites with PFS property over the non-PFS ones. Note that performance considerations implies preferring Ephemeral Elliptic-curve Diffie–Hellman over Ephemeral Diffie-Hellman. Consider the fact that combined elliptic-curve and post-quantum 1 was succeeded by combined elliptic-curve and post-quantum 2.
The symmetric key withkey size more than 128 bits as it is should be according to National Institute of Standards and Technology so it is not vulnerable to preimage attack and it cannreliably prove that message came from the stated sender (its authenticity) and has not been changed, so connection is not open for a man-in-the-middle attack.
Remove the cipher suite from the list of cipher suites supported by your server.