CNS - Unit 3 Hash Functions and Digital Signatures

Release of message contents to any person or process not possessing the appropriate cryptographic key is called _________.

• Traffic Analysis

• Disclosure

• Masquerade

• Non-repudiation

Which of the following are the different classes of message authentication function?

• hash function

• Message Encryption

• Message Authentication Code

• All of the above

What makes MAC different from a hash function?

• Hash Function

• Message

• Secret Key

• Encryption algorithm

Which of the following brought the blockchain implementation to the limelight?

• Bitcoin

• Ethereum

• Zcash

• None of the above

Padding in MD5 is done so that the length L of the message satisfies which formula?

• L = 446 mod 512

• L = 896 mod 1024

• L = 324 mod 512

• L = 128 mod 512

• L = 448 mod 512

What is the size of each register used in SHA 512 algorithm?

• 32 bits

• 48 bits

• 16 bits

• 64 bits

• 128 bits

The total length of the message after padding and adding length representation in SHA 512 is ­­­­­­­­­­______________.

• L x 512 bits

• L x 1024 bits

• L x 1028 bits

• L x 128 bits

The Digital Signature Standard (DSS) creates a signature of size ________.

• 128 bits

• 512 bits

• 320 bits

• 348 bits

In HMAC, the block obtained as a result of XOR operation between K+ and opad is ______?

• So

• Si

• Ki

• Ko

What are the global public key components used in DSS?

• p,q,g,h

• p

• h

• g

• p,q,g