Cryptography MCQs – Page 3 – EasyExamNotes.com

#1. Which cryptographic algorithm is commonly used for digital signatures and supports both encryption and authentication?

A. RSA

B. AES

C. DES

D. DSA

E. HMAC

#2. What is the primary purpose of a digital envelope in public-key cryptography?

A. Encrypt data traffic

B. Decrypt data traffic

C. Sign digital certificates

D. Generate session keys

E. Authenticate users

#3. Which encryption algorithm operates on blocks of data and divides the plaintext into fixed-size blocks during encryption?

A. Stream cipher

B. Block cipher

C. Hybrid cipher

D. Hash function

E. Asymmetric cipher

#4. In Diffie-Hellman key exchange, which of the following is publicly shared between the parties but never transmitted?

A. Private key

B. Public key

C. Session key

D. Initialization vector

E. Authentication key

#5. Which cryptographic algorithm is commonly used for secure email communication and can be used for data encryption and digital signatures?

A. RSA

B. AES

C. DES

D. PGP

E. HMAC

#6. What is the primary purpose of a certificate revocation list (CRL) in public-key infrastructure (PKI)?

A. Authenticate users

B. Encrypt data traffic

C. Verify the integrity of messages

D. Revoke compromised certificates

E. Generate digital signatures

#7. Which encryption algorithm is widely used for securing wireless networks and is part of the WPA2 standard?

A. AES

B. DES

C. RSA

D. 3DES

E. Blowfish

#8. What is the purpose of a nonce in cryptographic protocols?

A. Random number generation

B. Data Encryption

C. Data Compression

D. Data Integrity

E. Data Storage

#9. Which encryption mode ensures that the same plaintext block encrypted multiple times produces different ciphertexts?

A. Electronic Codebook (ECB)

B. Cipher Block Chaining (CBC)

C. Cipher Feedback (CFB)

D. Output Feedback (OFB)

E. Counter (CTR)

#10. What is the main advantage of the elliptic curve cryptography (ECC) algorithm over traditional public-key algorithms?

A. Shorter key lengths

B. Faster computation

C. Simplicity of implementation

D. Higher security level

E. Lower memory requirements

#11. Which type of encryption algorithm uses the same key for both encryption and decryption and is commonly used for securing data transmission?

A. Symmetric

B. Asymmetric

C. Public Key

D. Hybrid

E. Session Key

#12. In the context of public-key cryptography, what is the purpose of the Certificate Authority (CA)?

A. Encrypt data traffic

B. Store public keys

C. Verify user's identity

D. Generate private keys

E. Sign digital certificates

#13. Which type of encryption algorithm operates on a continuous stream of data and is commonly used in wireless networks?

A. Symmetric stream cipher

B. Asymmetric stream cipher

C. Symmetric block cipher

D. Asymmetric block cipher

E. Hash function

#14. What is the purpose of a Hardware Security Module (HSM) in cryptography?

A. Generate keys

B. Securely store keys

C. Encrypt data traffic

D. Authenticate users

E. Hashing

#15. What is the process of converting ciphertext back into plaintext called in cryptography?

A. Encryption

B. Hashing

C. Decryption

D. Compression

E. Encoding

#16. What is the purpose of key exchange algorithms in cryptography?

A. Encrypt data traffic

B. Generate keys

C. Authenticate users

D. Secure email communication

E. Password hashing

#17. Which encryption algorithm is commonly used for secure communication over the internet and supports key sizes of 128, 192, or 256 bits?

A. AES

B. DES

C. RSA

D. MD5

E. SHA

#18. In the Diffie-Hellman key exchange protocol, what is exchanged between the parties to establish a shared secret key?

A. Private keys

B. Public keys

C. Symmetric keys

D. Session keys

E. Authentication keys

#19. Which type of attack exploits the reuse of initialization vectors (IVs) in encryption algorithms like WEP and TKIP?

A. Brute Force Attack

B. Man-in-the-Middle

C. Replay Attack

D. Birthday Attack

E. Collision Attack

#20. What is the purpose of a nonce in cryptographic protocols?

A. Random number generation

B. Data Encryption

C. Data Compression

D. Data Integrity

E. Data Storage

TEST YOUR KNOWLEDGE WITH TOP MULTIPLE CHOICE QUESTIONS

#1. Which cryptographic algorithm is commonly used for digital signatures and supports both encryption and authentication?

#2. What is the primary purpose of a digital envelope in public-key cryptography?

#3. Which encryption algorithm operates on blocks of data and divides the plaintext into fixed-size blocks during encryption?

#4. In Diffie-Hellman key exchange, which of the following is publicly shared between the parties but never transmitted?

#5. Which cryptographic algorithm is commonly used for secure email communication and can be used for data encryption and digital signatures?

#6. What is the primary purpose of a certificate revocation list (CRL) in public-key infrastructure (PKI)?

#7. Which encryption algorithm is widely used for securing wireless networks and is part of the WPA2 standard?

#8. What is the purpose of a nonce in cryptographic protocols?

#9. Which encryption mode ensures that the same plaintext block encrypted multiple times produces different ciphertexts?

#10. What is the main advantage of the elliptic curve cryptography (ECC) algorithm over traditional public-key algorithms?

#11. Which type of encryption algorithm uses the same key for both encryption and decryption and is commonly used for securing data transmission?

#12. In the context of public-key cryptography, what is the purpose of the Certificate Authority (CA)?

#13. Which type of encryption algorithm operates on a continuous stream of data and is commonly used in wireless networks?

#14. What is the purpose of a Hardware Security Module (HSM) in cryptography?

#15. What is the process of converting ciphertext back into plaintext called in cryptography?

#16. What is the purpose of key exchange algorithms in cryptography?

#17. Which encryption algorithm is commonly used for secure communication over the internet and supports key sizes of 128, 192, or 256 bits?

#18. In the Diffie-Hellman key exchange protocol, what is exchanged between the parties to establish a shared secret key?

#19. Which type of attack exploits the reuse of initialization vectors (IVs) in encryption algorithms like WEP and TKIP?

#20. What is the purpose of a nonce in cryptographic protocols?

Results