TEST BANK Introduction to Cryptography with Coding Theory Questions and Correct Answers

MANUAL INTRODUCTION TO CRYPTOGRAPHY
WITH CODING THEORY ,3RD EDITION QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS Q&A
2026 |INSTANT DOWNLOAD PDF

1. What is the primary goal of cryptography?
A. Data compression
B. Secure communication
C. File formatting
D. Network routing
Rationale: Cryptography focuses on protecting information
from unauthorized access.
Correct Answer: B


2. Which of the following is NOT a cryptographic objective?
A. Confidentiality
B. Integrity
C. Availability
D. Authentication
Rationale: Availability is a system objective, not a core
cryptographic property.
Correct Answer: C

,3. In symmetric encryption, the key is:
A. Public only
B. Private only
C. Same for encryption and decryption
D. Generated by attacker
Rationale: Symmetric systems use one shared secret key.
Correct Answer: C


4. Which algorithm is a symmetric cipher?
A. RSA
B. AES
C. ECC
D. DSA
Rationale: AES is a widely used symmetric encryption standard.
Correct Answer: B


5. Public key cryptography uses:
A. One shared key
B. Two keys (public and private)
C. No keys
D. Session-only keys
Rationale: Asymmetric cryptography uses key pairs.
Correct Answer: B

,6. RSA is based on the difficulty of:
A. Sorting algorithms
B. Prime factorization
C. Matrix multiplication
D. Hash collisions
Rationale: RSA security relies on factoring large integers.
Correct Answer: B


7. A hash function produces:
A. Encrypted text
B. Fixed-size digest
C. Plaintext
D. Private key
Rationale: Hash functions output fixed-length digests.
Correct Answer: B


8. Which property is NOT required for a secure hash function?
A. Deterministic output
B. Preimage resistance
C. Reversibility
D. Collision resistance
Rationale: Hash functions must not be reversible.
Correct Answer: C

, 9. What is ciphertext?
A. Original message
B. Encrypted message
C. Decryption key
D. Hash output
Rationale: Ciphertext is the encrypted form of plaintext.
Correct Answer: B


10. Plaintext refers to:
A. Encrypted data
B. Original readable message
C. Key stream
D. Hash output
Rationale: Plaintext is the original message before encryption.
Correct Answer: B


11. In cryptography, confusion refers to:
A. Making encryption slow
B. Obscuring relationship between key and ciphertext
C. Data compression
D. Network routing
Rationale: Confusion hides key-ciphertext relationships.
Correct Answer: B