Insecure Cipher Suite

IANA name:

TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA

OpenSSL name:

ADH-CAMELLIA256-SHA

GnuTLS name:

TLS_DH_ANON_CAMELLIA_256_CBC_SHA1

Hex code:

0x00, 0x89

TLS Version(s):

TLS1.0, TLS1.1, TLS1.2

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Protocol:

Transport Layer Security (TLS)

Key Exchange:

Diffie-Hellman (DH)

Non-ephemeral Key Exchange:

This key exchange algorithm does not support Perfect Forward Secrecy (PFS) which is recommended, so attackers cannot decrypt the complete communication stream.

Authentication:

Anonymous (anon)

Anonymous key exchange:

Anonymous key exchanges are generally vulnerable to Man in the Middle attacks.

Encryption:

CAMELLIA with 256bit key in Cipher Block Chaining mode (CAMELLIA 256 CBC)

Cipher Block Chaining:

In 2013, researchers demonstrated a timing attack against several TLS implementations using the CBC encryption algorithm (see isg.rhul.ac.uk). Additionally, the CBC mode is vulnerable to plain-text attacks in TLS 1.0, SSL 3.0 and lower. A fix has been introduced with TLS 1.2 in form of the GCM mode which is not vulnerable to the BEAST attack. GCM should be preferred over CBC.

Hash:

HMAC Secure Hash Algorithm 1 (SHA)

Secure Hash Algorithm 1:

The Secure Hash Algorithm 1 has been proven to be insecure as of 2017 (see shattered.io).

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Included in RFC:

• RFC 5932

Machine-readable:

application/json