📖 From Operating System • 15. Security • 10 questions available
Practice MCQs for Cryptography as a Security Tool. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.
🔄 Last updated: 2026-07-27
Q1. An attacker crafts input that overflows a buffer and overwrites the saved return address. Which step guarantees that execution jumps to the injected shellcode?
💡 Difficulty: easy | ✅ Correct: B
Q2. A developer adds a random canary value before the return address to protect against overflow. Which mechanism best stops the attack?
💡 Difficulty: medium | ✅ Correct: C
Q3. A program has a 64‑byte buffer, the return address is located 8 bytes after the buffer, and the attacker’s shellcode is 20 bytes long. How many NOP bytes must precede the shellcode to fill the buffer completely?
💡 Difficulty: hard | ✅ Correct: C
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