Weak Cipher Suite
- IANA name:
- Hex code:
- 0xC0, 0x3F
- TLS Version(s):
- TLS1.0, TLS1.1, TLS1.2
- Transport Layer Security (TLS)
- Key Exchange:
- Diffie-Hellman (DH)
- Digital Signature Standard (DSS)
- ARIA with 256bit key in Cipher Block Chaining mode (ARIA 256 CBC)
- Secure Hash Algorithm 384 (SHA384)
- Included in RFC:
Diffie-Hellman key exchanges not using ephemeral keys do not support Perfect Forward Secrecy (PFS) which is recommended, so attackers cannot decrypt the whole communication stream.
The CBC mode is vulnerable to plain-text attacks with TLS 1.0, SSL 3.0 and lower. However a real fix is implemented with TLS 1.2 in which the GCM mode was introduced and which is not vulnerable to the BEAST attack. GCM should be preferred over CBC (cf. BEAST).