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Components
A+
Key Exchange Method
Name
Diffie–Hellman Ephemeral (DHE)
Security
Ephemeral Diffie-Hellman[142][143][144][145] is a variant of Diffie-Hellman[269][270][271][272][273] key exchange[467] protocol that has forward secrecy[135][136][137][138], 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.
Recommendations
Always prefer cipher suites with PFS property over the non-PFS ones. Note that performance considerations implies preferring Ephemeral Elliptic-curve Diffie–Hellman[91][92] over Ephemeral Diffie-Hellman[142][143][144][145].
C
Authentication Method
Name
Digital Signature Standard (DSS)
Security
Digital Signature Algorithm[83][84][85][86][87][88] is a digital signature[231][232][233][234] algorithm, which is considered secure[500][501], but 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.
Recommendations
Remove the cipher suite from the list of cipher suites supported by your server.
F
Encryption Type
Name
DES
Security
Encryption algorithm Data Encryption Standard[96][97][98][99][100] is considered obsolete[400][401][402][403][404][405]. It is weakened against brute-force attack[555]. It cannot provide confidentiality[198][199][200], so connection is available or disclosed to unauthorized individuals, entities, or processes.
Recommendations
Remove the cipher suite from the list of cipher suites supported by your server.
Remove the cipher suite from the list of cipher suites supported by your server or at least set the cipher suite order explicitly and any cipher suite modes be preferred over ciphers suites with CBC modes.
D
Encryption Key Size
Name
56
Security
Any symmetric key[193][194][195] with key size[438] less than 128 bits are disallowed by National Institute of Standards and Technology[428][429] as it is vulnerable to preimage attack[215] in theory. It cannot reliably prove that message came from the stated sender (its authenticity) and has not been changed, so connection is open for a man-in-the-middle attack[414].
Recommendations
Remove the cipher suite from the list of cipher suites supported by your server.
Remove the cipher suite from the list of cipher suites supported by your server, or setup yout server to enforce changing session key regularly (rekeying[567]).
