Certified Secure Software Lifecycle Professional (CSSLP) — Question 61

In which of the following cryptographic attacking techniques does an attacker obtain encrypted messages that have been encrypted using the same encryption algorithm?

Answer options

• A. Chosen plaintext attack
• B. Chosen ciphertext attack
• C. Ciphertext only attack
• D. Known plaintext attack

Correct answer: C

Explanation

The correct answer is C, as a ciphertext only attack focuses on deciphering the messages without any additional information, relying solely on the encrypted data. The other options involve different scenarios where the attacker has more information or control over the encryption process, such as having access to plaintext or the ability to choose specific data to be encrypted.