Insecure Cipher Suite

IANA name:

TLS_RSA_EXPORT_WITH_DES40_CBC_SHA

Hex code:

0x00, 0x08

TLS Version(s):

TLS1.0, TLS1.1

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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:

Data Encryption Standard with 40bit key in Cipher Block Chaining mode (DES40 CBC)

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).

Data Encryption Standard:

DES is considered weak, primarily due to its short key-lengths of 40 or 65-Bit. Furthermore, it has been withdrawn as a standard by the National Institute of Standards and Technology in 2005.

Hash:

Secure Hash Algorithm 1 (SHA)

Secure Hash Algorithm 1 MAC:

The Secure Hash Algorithm 1 has been proven to be vulnerable to collision attacks as of 2017 (cf. shattered.io). While this does not affect its usage as a MAC, safer alternatives such as SHA-256, or SHA-3 should be considered.

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Included in RFC:

• RFC 4346

Machine-readable:

application/json