Insecure TLS_KRB5_EXPORT_WITH_RC4_40_MD5

IANA name:

TLS_KRB5_EXPORT_WITH_RC4_40_MD5

Hex code:

0x00, 0x2B

TLS Version(s):

TLS1.0, TLS1.1, TLS1.2, TLS1.3

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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 (see freakattack.com).

Key Exchange:

Kerberos 5 (KRB5)

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:

Kerberos 5 (KRB5)

Encryption:

Rivest Cipher 4 with 40bit key (RC4 40)

Rivest Cipher 4:

IETF has officially prohibited RC4 for use in TLS in RFC 7465. Therefore, it can be considered insecure.

Hash:

HMAC Message Digest 5 (MD5)

Message Digest 5:

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

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Included in RFC:

• RFC 2712

Machine-readable:

application/json