Crucial Exams

Certified Ethical Hacker (CEH) Practice Question

During a code review you notice that a proprietary routine encrypts each message with DES using key K1 and immediately re-encrypts the result with DES using a different key K2 (classic 2-DES). Which cryptanalytic technique allows an attacker to recover both 56-bit keys with roughly 257 operations instead of brute-forcing 2112 possibilities?

  • Slide attack

  • Linear cryptanalysis

  • Meet-in-the-middle attack

  • Differential cryptanalysis

Certified Ethical Hacker (CEH)
Cryptography
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