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Which of the following is a correct statement about Grover's algorithm in relation to symmetric cryptography?

easy📝 Factual Q3 of 15
Cybersecurity - Emerging Security Topics
Which of the following is a correct statement about Grover's algorithm in relation to symmetric cryptography?
AIt completely breaks AES encryption instantly
BIt is used to factor large prime numbers
CIt can speed up brute-force attacks by roughly square root factor
DIt has no impact on symmetric cryptography
Step-by-Step Solution
Solution:

  1. Step 1: Understand Grover's algorithm effect

    Grover's algorithm speeds up search problems, including brute-force key search, by about square root.

  2. Step 2: Apply to symmetric cryptography

    This means symmetric keys are effectively halved in strength, not instantly broken.

  3. Final Answer:

    It can speed up brute-force attacks by roughly square root factor -> Option C

  4. Quick Check:

    Grover's speedup = square root brute-force [OK]
Quick Trick: Grover halves symmetric key strength [OK]
Common Mistakes:
MISTAKES
  • Thinking Grover instantly breaks AES
  • Confusing Grover with Shor's algorithm
  • Believing Grover factors primes
  • Assuming no impact on symmetric keys

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