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TLS-KRB5-WITH-IDEA-CBC-MD5 Cipher Suite

A breakdown of the Cipher Suite TLS_KRB5_WITH_IDEA_CBC_MD5, its strengths, and its weaknesses.

Key Exchange Mechanism

Kerberos 5 - KRB5

Grade - C

Low usage

Cipher

Simplified International Data Encryption Algorithm - IDEA

Grade - C

Low usage

Hash

Message Digest 5 - MD5

Grade - F

MD5 is considered highly insecure because chosen prefixes can be generated with minimal computing power. This vulnerability allows attackers to create different inputs that produce the same hash, leading to potential data breaches and integrity issues. Consequently, MD5 is unsuitable for modern cryptographic needs and should be avoided in favor of more secure algorithms.

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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