· 2 min read

TLS-ECDH-ECDSA-WITH-CAMELLIA-256-CBC-SHA384 Cipher Suite

A breakdown of the Cipher Suite TLS_ECDH_ECDSA_WITH_CAMELLIA_256_CBC_SHA384, its strengths, and its weaknesses.

Key Exchange Mechanism

Elliptic Curve Diffie Hellman - ECDH

Grade - B

Static Elliptic Curve Diffie Hellman (ECDH) does not use ephemeral (temporary) keys, meaning it violates perfect forward secrecy. ECDHE should be used in preference.

Authentication

Elliptic Curve Digital Signature Algorithm - ECDSA

Grade - A

ECDSA (Elliptic Curve Digital Signature Algorithm) is used in cipher suites for authentication and integrity verification. Its efficiency in generating and verifying digital signatures makes it suitable for secure communication protocols like TLS, ensuring data confidentiality and integrity during exchanges over networks.

Cipher

Camellia - CAMELLIA

Grade - C

Low usage

Hash

Secure Hash Algorithm 384 Bit - SHA384

Grade - A

Improving greatly from SHA1, SHA-256 and above create secure hashes through robust cryptographic algorithms that ensure collision resistance and preimage resistance. They process input data in fixed-size blocks, applying complex mathematical transformations that make it computationally impractical to reverse-engineer the original data from its hash.

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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