312-50V10 Question #28: Real Exam Question with Answer & Explanation

The correct answer is C: Adaptive chosen-plaintext attack. An adaptive chosen-plaintext attack is distinguished by the attacker's ability to dynamically select each new plaintext query based on the results of all previous encryption queries, allowing iterative refinement of the attack.

Cryptography

Question

In which of the following cryptography attack methods, the attacker makes a series of interactive queries, choosing subsequent plaintexts based on the information from the previous encryptions?

Options

AChosen-plaintext attack
BCiphertext-only attack
CAdaptive chosen-plaintext attack
DKnown-plaintext attack

Explanation

An adaptive chosen-plaintext attack is distinguished by the attacker's ability to dynamically select each new plaintext query based on the results of all previous encryption queries, allowing iterative refinement of the attack.

Common mistakes.

A. A chosen-plaintext attack allows the attacker to encrypt arbitrary plaintexts, but all plaintexts are selected non-adaptively (in advance), without using feedback from previous encryptions.
B. A ciphertext-only attack gives the attacker access only to intercepted ciphertexts with no ability to query an encryption oracle or choose any plaintexts.
D. A known-plaintext attack provides the attacker with fixed pairs of plaintexts and their corresponding ciphertexts, but the attacker cannot choose which plaintexts are used.

Concept tested. Adaptive chosen-plaintext cryptographic attack model

Reference. https://csrc.nist.gov/glossary/term/adaptive_chosen_plaintext_attack

Topics

#adaptive chosen-plaintext attack#cryptanalysis#attack methods#plaintext

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