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TLS-SRP-SHA-DSS-WITH-3DES-EDE-CBC-SHA Cipher Suite

A breakdown of the Cipher Suite TLS_SRP_SHA_DSS_WITH_3DES_EDE_CBC_SHA, its strengths, and its weaknesses.

Authentication

Digital Signature Standard - DSS

Grade - C

Low usage

Hash

Secure Hash Algorithm - SHA

Grade - D

Chosen prefix attacks for SHA1 are feasible at an accessible cost to a well-funded adversary. This level of expense, while significant, does not pose a substantial barrier to attackers with sufficient resources, making such attacks a credible threat.

Cipher Mode

Cipher Block Chaining - CBC

Grade - D

Cipher Block Chaining (CBC) mode is vulnerable to the Lucky13 and POODLE (in TLS v1.2 and below) attacks. The Lucky13 attack exploits timing discrepancies in padding validation, allowing attackers to gradually reveal plaintext. The POODLE attack leverages padding errors to decrypt ciphertext by repeatedly modifying and sending it to the server, observing the error responses. These vulnerabilities arise from CBC’s handling of padding and error messages, making it less secure than modern encryption modes like Galois Counter Mode (GCM), which offer stronger integrity and confidentiality guarantees.

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