📝 Key distribution as a Security Tool

📖 From Operating System • 15. Security • 7 questions available

Practice MCQs for Key distribution as a Security Tool. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-27

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📝 Sample Questions

Q1. What is the primary purpose of a key distribution center (KDC) in symmetric cryptography?

🔹 A. To generate and securely deliver session keys to communicating parties

🔹 B. To encrypt data transmitted over the network

🔹 C. To authenticate users via public keys

🔹 D. To store passwords in plaintext

💡 Difficulty: easy | ✅ Correct: A

Q2. How does a NOP sled facilitate successful execution of shellcode after a buffer overflow?

🔹 A. It encrypts the shellcode to evade detection

🔹 B. It shortens the distance to the return address

🔹 C. It provides a sequence of no‑operation instructions that slides execution into the shellcode

🔹 D. It disables security checks in the operating system

💡 Difficulty: medium | ✅ Correct: C

Q3. Assume a 32‑bit system where the stack grows downward. The buffer starts at address \(0xBFFFF0\) and occupies 12 bytes. The saved frame pointer is at \(0xBFFFFC\) and the return address is at \(0xBFFFF8\). If an attacker writes 16 bytes of data starting at the buffer, which address will the CPU use for the next return?

🔹 A. \(0xBFFFF8\)

🔹 B. \(0xBFFFFC\)

🔹 C. \(0xBFFFF0\)

🔹 D. \(0xBFFFF4\)

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 The Security Problem in Operating System 📝 Program Threats in Operating System 📝 Trojan horse 📝 Trap door 📝 Logic bomb

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