Knowledge Base

C

Cipher Suite: TLS_­ECDHE_­PSK_­WITH_­3DES_­EDE_­CBC_­SHA

Summary

code:
(0xc0, 0x34)
IANA Name:
TLS_ECDHE_PSK_WITH_3DES_EDE_CBC_SHA

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Components

A+
Key Exchange Method
Name
Elliptic-curve Diffie–Hellman Ephemeral (ECDHE)
Security
Ephemeral Elliptic-curve Diffie–Hellman[91][92] is a variant of Elliptic-curve Diffie–Hellman[490][491] key exchange 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
Pre-shared Key (PKS)
Security
The pre-shared key[124] can ensure authenticity[201][202][203] of the communicating parties mutually based on symmetric key[193][194][195]s that are shared in advance among the parties. Combined with a key exchange[467] that has forward secrecy[135][136][137][138] property algorithm can protect against dictionary attack[504][505]s by passive eavesdroppers (but not active attackers). Pre-shared keys with low entropy[380], may caused by a weakness[359][360][361] of random number generator[1][2][3], can be easily broken in brute-force attack[555]. 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
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.
C
Encryption Type
Name
Triple DES (TDEA) EDE
Security
Encryption algorithm Triple DES[216][217][218] is a block cipher[524][525][526][527] which is still recognized as secure, but deprecated. It has multiple vulnerabilities[396][397][398][399] (eg: sweet32 attack[496][497][498][499], meet-in-the-middle attack[37], brute-force attack[555]) and it is considered as weak and disallowed by National Institute of Standards and Technology[428][429] after 2023.
Recommendations
Remove the cipher suite from the list of cipher suites supported by your server.
B
Encryption Mode
Name
Cipher Block Chaining (CBC)
Security
Encryption mode is cipher block chaining[132][133][134]. It is vulnerable[103] to timing attack[479] (eg: Lucky Thirteen attack[331][332]) and padding oracle attack[45][46][47][48] (eg: POODLE attack[362][363][364]).
Recommendations
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.
A+
Encryption Key Size
Name
128
Security
The symmetric key[193][194][195] withkey size[438] more than 128 bits as it is should be according to National Institute of Standards and Technology[428][429] so it is not vulnerable to preimage attack[215] 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[414].
Recommendations
Remove the cipher suite from the list of cipher suites supported by your server.
C
Encryption Block Size
Name
64
Security
Any block cipher[524][525][526][527] uses a block size[409] of 64 bits is vulnerable to sweet32 attack[496][497][498][499].
Recommendations
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]).
A-
Message Authentication Code
Name
SHA-1
Security
message authentication code[128][129][130][131] is a hashed message authentication code[418][419][420][421][422][423][424] which is considered secure[159], despite the fact that the underlayingcryptographic hash function[510][511][512][513] (Secure Hash Algorithm 1[204][205][206]) is considered insecure[370][371][372][373][374][375][376].
Recommendations
If your application or requirements specifically call for the use of a message authentication code[128][129][130][131] that does not provide authenticated encryption[563] prefer block cipher mode of operation[293][294][295][296][297] (eg: counter with CBC-MAC[266][267][268], Galois/Counter Mode[65][66][67][68] or message authentication code[128][129][130][131] (eg: Poly1305[289][290]) that proved authenticated encryption over the ones which does not provide it. In case of a hashed message authentication code[418][419][420][421][422][423][424] prefer message authentication code[128][129][130][131] based on Secure Hash Algorithm 2[71][72][73] over the ones based on Secure Hash Algorithm 1[204][205][206].