📝 Symmetric encryption as a Security Tool

📖 From Operating System • 15. Security • 12 questions available

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

🔄 Last updated: 2026-07-27

Easy Questions

Medium Questions

Hard Questions

📝 Sample Questions

Q1. What is the primary characteristic of symmetric encryption that distinguishes it from asymmetric encryption?

🔹 A. Uses two different keys for encryption and decryption

🔹 B. Uses the same secret key for both encryption and decryption

🔹 C. Relies on public key infrastructure

🔹 D. Employs quantum entanglement

💡 Difficulty: easy | ✅ Correct: B

Q2. Which mode of operation is best suited for encrypting a continuous data stream while preventing visible patterns in the ciphertext?

🔹 A. Electronic Codebook (ECB)

🔹 B. Cipher Block Chaining (CBC)

🔹 C. Output Feedback (OFB)

🔹 D. Counter (CTR)

💡 Difficulty: medium | ✅ Correct: A

Q3. Given the 8‑bit plaintext block 00101101 and the 8‑bit key 11001010, what ciphertext results from a simple XOR (one‑time‑pad) encryption?

🔹 A. 11100111

🔹 B. 11010101

🔹 C. 110011

🔹 D. 10101010

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

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