- 1. Cryptography is the practice and study of techniques for secure communication in the presence of third parties. It involves creating and analyzing protocols that prevent third parties or the public from reading private messages. Various aspects in information security such as data confidentiality, data integrity, authentication, and non-repudiation are enabled by cryptographic techniques. Cryptography is essential for securing sensitive information in sectors such as government, finance, healthcare, and communication networks. Modern cryptography employs algorithms and mathematical principles to ensure data protection, confidentiality, and privacy.
Which type of cryptography uses the same key for both encryption and decryption?
A) Quantum cryptography
B) Hashing algorithms
C) Asymmetric cryptography
D) Symmetric cryptography
- 2. What does the term 'plaintext' refer to in cryptography?
A) Encrypted data
B) Unencrypted data
C) Digital signatures
D) Public keys
- 3. What is a 'cipher' in cryptography?
A) Secure network protocol
B) Algorithm for encryption and decryption
C) Hardware security module
D) Public key infrastructure
- 4. Which of the following is a form of asymmetric cryptography?
A) Triple DES
B) RSA
C) Blowfish
D) AES
- 5. Which cryptographic primitive is used for generating a fixed-size hash of data?
A) Hash function
B) Key exchange algorithm
C) Symmetric key encryption
D) Public key encryption
- 6. What is the term for the process of converting plaintext into ciphertext?
A) Key exchange
B) Decryption
C) Hashing
D) Encryption
- 7. What is the process of securely exchanging cryptographic keys called?
A) Digital signing
B) Key exchange
C) Public key encryption
D) Hashing
- 8. What is the process of converting ciphertext back into plaintext called?
A) Hashing
B) Key exchange
C) Encryption
D) Decryption
- 9. Which cryptographic hash function is commonly used for integrity checking?
A) SHA-256
B) AES
C) SHA-1
D) MD5
- 10. What does PGP stand for in relation to cryptography?
A) Private Guard Protocol
B) Public Key Globus
C) Pretty Good Privacy
D) Protocol for Global Privacy
- 11. What is the term for a weakness in a cryptographic system that can be exploited by an attacker?
A) Hash
B) Key
C) Vulnerability
D) Salting
- 12. Which of the following is a symmetric encryption algorithm?
A) Diffie-Hellman
B) AES
C) RSA
D) ECC
- 13. Which cryptographic protocol is commonly used to secure web traffic (HTTPS)?
A) SSH
B) SSL/TLS
C) PGP
D) IPSec
- 14. What is the use of padding in encryption?
A) Increasing Key Length
B) Improving Compression
C) Ensuring Blocks are a Fixed Size
D) Preventing Brute Force Attacks
- 15. What type of encryption ensures that the same plaintext message will always generate the same cipher text?
A) Probabilistic
B) Deterministic
C) Public Key
D) Asymmetric
- 16. Which type of encryption uses two keys, one for encryption and the other for decryption?
A) Symmetric
B) Diffie-Hellman
C) Hashing
D) Asymmetric
- 17. Which cipher involves shifting the letters of the alphabet a certain number of places?
A) AES
B) Caesar
C) Playfair
D) Vigenère
- 18. What does HMAC stand for in cryptography?
A) Hash-Based Message Authentication Code
B) Highly Manufactured Argument Chunk
C) Hypertext Markup Algorithm Code
D) Human-Machine Authorization Comparison
- 19. What is the term for a secret value used in symmetric encryption algorithms?
A) Key
B) Salt
C) Hash
D) IV (Initialization Vector)
- 20. Which cipher machine was used by the Germans during World War II?
A) Morse
B) Colossus
C) Enigma
D) Bletchley
- 21. What is the basic principle behind the security of elliptic curve cryptography?
A) The Birthday Paradox
B) The Caesar Cipher
C) The Discrete Logarithm Problem
D) The Vigenère Cipher
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