CISSP – Information Systems Security Architecture Professional (ISSAP) — Question 88

In which of the following cryptographic attacking techniques does the attacker pick up the information to be encrypted and take a copy of it with the encrypted data?

Answer options

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

Correct answer: C

Explanation

The correct answer is C, Chosen plaintext attack, because this method allows the attacker to choose the plaintext they wish to encrypt and then observe the corresponding ciphertext. The other options do not involve the attacker selecting the plaintext; A involves chosen ciphertext, B uses already known plaintext, and D refers to attacks using only ciphertext without any context.