Weak TLS_DH_RSA_WITH_AES_256_GCM_SHA384

IANA name:

TLS_DH_RSA_WITH_AES_256_GCM_SHA384

Hex code:

0x00, 0xA1

TLS Version(s):

TLS1.2, TLS1.3

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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.

Raccoon Attack:

The so-called Raccoon Attack affects the specifications of TLS 1.2 and below when using a DH(E) key exchange. According to the researchers, while very hard to exploit, in rare circumstances this timing attack allows attackers to decrypt the connection between users and the server. A fix has been introduced in the TLS 1.3 specification.

Authentication:

Rivest Shamir Adleman algorithm (RSA)

RSA Authentication:

There are reports that servers using the RSA authentication algorithm with keys longer than 3072-bit may experience heavy performance issues leading to connection timeouts and even service unavailability if many clients open simultaneous connections.

Encryption:

AEAD Advanced Encryption Standard with 256bit key in Galois/Counter mode (AES 256 GCM)

Hash:

Secure Hash Algorithm 384 (SHA384)

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Included in RFC:

• RFC 5288

Machine-readable:

application/json