Authentication and Cryptography Quiz

Which of the following ensures data integrity in message authentication?

• Encryption

• MAC

• Key exchange

• Random numbers

What is the main purpose of a hash function in authentication?

• Encrypt the message

• Provide a fixed-length output from input data

• Generate random keys

• Compress large data into smaller packets

Which of these is NOT a property of a secure hash function?

• Pre-image resistance

• Collision resistance

• Key-dependent output

• Avalanche effect

HMAC provides message authentication by combining a cryptographic hash function with:

• A public key

• A symmetric key

• An initialization vector

• A random number

Which hash function is the basis for HMAC and widely used in authentication?

• SHA

• MD5

• CRC

• DES

What is the primary purpose of a digital signature?

• Ensure message confidentiality

• Verify the sender's identity and data integrity

• Encrypt the message

• Distribute symmetric keys

Which digital signature algorithm is used in the Digital Signature Standard (DSS)?

• RSA

• DSA

• ECC

• AES

The Schnorr Digital Signature Scheme is based on which mathematical problem?

• Discrete logarithm problem

• Factorization problem

• Hash collision problem

• Subset-sum problem

Which of the following is a key feature of the ElGamal cryptosystem?

• It uses elliptic curves for encryption

• It is based on the difficulty of discrete logarithms

• It provides symmetric encryption

• It is used exclusively for hashing

In a challenge-response protocol, the purpose of the challenge is to:

• Encrypt the message

• Verify the identity of the entity

• Generate a new key

• Create a hash of the message