In the field of cryptanalysis, what is meant by a "rubber-hose" attack?

Question

Options

• AForcing the targeted keystream through a hardware-accelerated device such as an ASIC.
• BA backdoor placed into a cryptographic algorithm by its creator.
• CExtraction of cryptographic secrets through coercion or torture.
• DAttempting to decrypt ciphertext by making logical assumptions about the contents of the original

• A
  4% (1)
• C
  89% (24)
• D
  7% (2)

Explanation

Rubber-Hose Attack Explained

A rubber-hose attack refers to extracting cryptographic secrets (passwords, keys, etc.) through coercion, intimidation, or physical torture of the person who holds that information - bypassing the mathematics of cryptography entirely by targeting the human element. The name is a dark metaphor for physically beating someone with a rubber hose until they reveal their secrets, making C correct.

Why the distractors are wrong:

• A describes hardware acceleration for cryptographic operations (e.g., ASICs used in Bitcoin mining or encryption offloading) - a legitimate performance technique, not an attack on humans.
• B describes a backdoor or kleptographic attack, where a creator secretly embeds a weakness into an algorithm (e.g., the Dual_EC_DRBG controversy).
• D describes a crib-dragging or known-plaintext attack, where an analyst uses logical assumptions about plaintext to break ciphertext - a purely mathematical approach.

Memory Tip: Think of the rubber hose as a physical tool - this attack skips all the complex math and goes straight to hurting the person who knows the secret. If you remember "rubber hose = real-world physical coercion," you'll never confuse it with technical cryptanalysis methods.

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