CSSLP Question #99: Real Exam Question with Answer & Explanation

Question

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

Options

• AChosen plaintext attack
• BChosen ciphertext attack
• CCiphertext only attack
• DKnown plaintext attack

Explanation

A ciphertext-only attack is a cryptographic attack where the attacker only has access to a collection of encrypted messages and the encryption algorithm, with no corresponding plaintext.

Common mistakes.

• A. A chosen-plaintext attack (CPA) is an attack where the attacker can choose arbitrary plaintexts to be encrypted and obtain their corresponding ciphertexts.
• B. A chosen-ciphertext attack (CCA) is an attack where the attacker can choose arbitrary ciphertexts to be decrypted and obtain their corresponding plaintexts.
• D. A known-plaintext attack (KPA) is an attack where the attacker has access to a collection of ciphertexts and their corresponding plaintexts.

Concept tested. Cryptographic attack types - ciphertext-only

Reference. https://learn.microsoft.com/en-us/windows/win32/secgloss/c-gly

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