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Key Exchange Method
Elliptic-curve Diffie–Hellman Ephemeral (ECDHE)
Ephemeral Elliptic-curve Diffie–Hellman is a variant of Elliptic-curve Diffie–Hellman key exchange that has 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.
Pre-shared Key (PKS)
The pre-shared key can ensure authenticity of the communicating parties mutually based on symmetric keys that are shared in advance among the parties. Combined with a key exchange that has forward secrecy property algorithm can protect against dictionary attacks by passive eavesdroppers (but not active attackers). Pre-shared keys with low entropy, may caused by a weakness of random number generator, can be easily broken in brute-force attack. Leading client applications do not use this algorithm. Unless your application or requirements specifically call for their use, it is generally safer to avoid cipher suites that are not adopted and supported by a critical mass of the industry.
If your application or requirements specifically call for the use of algorithms which are not used by the leading client applications set the cipher suite order explicitly and cipher suites used by the leading client applications be preferred over the ones which do not used by them.
Encryption algorithm is a null encryption that cannot provide confidentiality, so connection is available or disclosed to unauthorized individuals, entities, or processes.
Remove the cipher suite from the list of cipher suites supported by your server.