Insecure Cipher Suite

IANA name:

TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5

Hex code:

0x00, 0x06

TLS Version(s):

TLS1.0, TLS1.1, TLS1.2

---

Protocol:

Export-grade Transport Layer Security (TLS EXPORT)

Export-grade cipher suite:

Export ciphers used to be legally exportable from the United States of America in the 1990s, when exporting military technology was heavily restricted. Nowadays, they are considered insecure (cf. FREAK Attack).

Key Exchange:

Rivest Shamir Adleman algorithm (RSA)

Authentication:

Rivest Shamir Adleman algorithm (RSA)

Encryption:

Rivest Cipher 2 with 40bit key in Cipher Block Chaining mode (RC2 CBC 40)

Cipher Block Chaining:

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).

Rivest Cipher 2:

There exists a related-key attack found in 1997. With this attack, RC2 can be broken (cf. RC2 related-key analysis).

Hash:

Message Digest 5 (MD5)

Message Digest 5:

The Message Digest 5 algorithm suffers form multiple vulnerabilities and is considered insecure.

---

Included in RFC:

• RFC 4346

Machine-readable:

application/json