Crucial Exams

Certified Ethical Hacker (CEH) Practice Question

While reviewing an IPsec VPN configuration during a penetration test, you notice that a new tunnel specifies AES-256 in Galois/Counter Mode (GCM) instead of AES-256 in CBC mode. From a cryptographic standpoint, which extra security capability does AES-GCM provide natively, removing the need for a separate AH or HMAC?

  • Built-in key stretching to mitigate brute-force attacks

  • Automatic perfect forward secrecy through implicit key agreement

  • Resistance to differential cryptanalysis by masking S-box outputs

  • Authenticated encryption that assures message integrity

Certified Ethical Hacker (CEH)
Cryptography
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