1. Question 1 — Symmetric Encryption Characteristic

• ✅ Uses the same key for both encryption and decryption

• ❌ Slower than asymmetric

• ❌ Requires certificate

• ❌ Uses two keys

Explanation:
Symmetric encryption always uses one shared key.

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2. Question 2 — Why asymmetric is secure for key distribution

• ❌ Single key

• ✅ Uses separate public and private keys

• ❌ Faster

• ❌ No keys required

Explanation:
The public key can be openly shared without risking decryption.

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3. Question 3 — RSA security foundation

• ❌ Speed

• ❌ Single key

• ✅ Difficulty of factoring large composite numbers

• ❌ Use of prime numbers

Explanation:
RSA security relies on the fact that factoring huge composite numbers is computationally infeasible.

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4. Question 4 — Attack trying all key combinations

• ❌ Chosen ciphertext

• ❌ MitM

• ✅ Brute-force attack

• ❌ Dictionary attack

Explanation:
Brute-force = exhaustively testing every possible key.

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5. Question 5 — Dictionary attack weakness

• ❌ Only works with symmetric

• ✅ It only works if the password is a common word

• ❌ Slower than brute-force

• ❌ Requires real-time access

Explanation:
Dictionary attacks rely on lists of common passwords.

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6. Question 6 — Why MitM attacks are dangerous

• ✅ Attackers can intercept and alter communication

• ❌ Require brute force

• ❌ Require physical access

• ❌ Impossible to detect

Explanation:
MitM attackers can read AND modify messages secretly.

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7. Question 7 — Pattern detection in ciphertext

• ❌ Known plaintext

• ✅ Linear cryptanalysis

• ❌ Differential cryptanalysis

• ❌ Timing attacks

Explanation:
Linear cryptanalysis studies linear patterns in encrypted data.

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8. Question 8 — Good key management practice

• ❌ Store keys in plain text

• ❌ Reuse same key for many apps

• ✅ Implement access controls for key retrieval

• ❌ Share keys via email

Explanation:
Keys must be securely stored and access-controlled.

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9. Question 9 — What hash function does

• ❌ Encrypts

• ✅ Generates fixed-size output from input data

• ❌ Compresses

• ❌ Stores data

Explanation:
Hashing is a one-way function producing a fixed-length digest.

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10. Question 10 — Digital signature purpose

• ✅ Verify authenticity and integrity

• ❌ Compress data

• ❌ Encrypt whole message

• ❌ Generate random keys

Explanation:
Digital signatures confirm who sent the message and that it wasn’t altered.

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🧾 Summary Table

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