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ECDHE (Elliptic-curve Diffie-Hellman Ephemeral)
Ephemeral Elliptic-curve Diffie–Hellman[432][433] is a variant of Elliptic-curve Diffie–Hellman[114][115] key exchange that has forward secrecy[127][128][129][130], 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.
SM2 (ShangMi 2)
The SM2[605][606] is a digital signature[107][108][109][110] algorithm, part of the Chinese ShangMi (SM) cryptography standards, using elliptic-curve cryptography[118][119][120][121]. 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.
SM4 (ShangMi 4)
Encryption algorithm SM4[598][599][600][601][602] is a block cipher[78][79][80][81] which is considered secure[603][604], 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.
Remove the cipher suite from the list of cipher suites supported by your server.
CCM (counter with CBC-MAC)
block cipher mode of operation[82][83][84][85][86] counter with CBC-MAC[32][33][34] is considered secure. It provides provides authenticated encryption[74] which simultaneously assure the confidentiality[91][92][93] and authenticity[75][76][77] of data.
If your application or requirements specifically call for the use of a message authentication code[135][136][137][138] that does not provide authenticated encryption[74] prefer block cipher mode of operation[82][83][84][85][86] (eg: counter with CBC-MAC[32][33][34], Galois/Counter Mode[46][47][48][49] or message authentication code[135][136][137][138] (eg: Poly1305[458][459]) that proved authenticated encryption over the ones which does not provide it.
128
The symmetric key[185][186][187] withkey size[184] more than 128 bits as it is should be according to National Institute of Standards and Technology[470][471] so it is not vulnerable to preimage attack[67] 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[61].
Remove the cipher suite from the list of cipher suites supported by your server.
SM3 (ShangMi 3)
The message authentication code[135][136][137][138] is a hashed message authentication code[139][140][141][142][143][144][145] where the underlaying cryptographic hash function[94][95][96][97] (SM3[610][611][612]) is considered secure[613][614]. It does not provide authenticated encryption[74] which simultaneously assure the confidentiality[91][92][93] and authenticity[75][76][77] of data.
Leading client applications do not use this type of message authentication code[135][136][137][138]. 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 a message authentication code[135][136][137][138] prefer one that does provide authenticated encryption[74], like Poly1305[458][459] or block cipher mode of operation[82][83][84][85][86] counter with CBC-MAC[32][33][34] or Galois/Counter Mode[46][47][48][49]. In case of a hashed message authentication code[139][140][141][142][143][144][145] prefer message authentication code[135][136][137][138] based on Secure Hash Algorithm 2[212][213][214] over the ones based on other cryptographic hash function[94][95][96][97].
