CRYPTOGRAPHY

A message is authentic and digitally signed if sent with:

• A message digest/hash encrypted with the sender’s private key

• A message digest/hash encrypted with the sender’s public key

• A message digest/hash encrypted with the receiver’s private key

• A message digest/hash encrypted with the receiver’s private key

Digital Signatures are:

•  

  Proof of authenticity of the sender

• Proof of authenticity of the receiver

• Proof of authenticity of the verifier

• Proof of authenticity of Alice

In symmetric-key cryptography, the key used by sender and receiver is

• Different

• Shared

• Two keys are used

• None

Advanced Encryption Standard (AES), has three different configurations with respect to number of rounds and

• 
  Key Size

• Datasize

• Round Size

• Encryption Size

A hash function guarantees integrity of a message. It guarantees that message has not be

• Replaced

• Over view

• Changed

• 
  Left

Message digest is referred to:

• RSA

• Digital signature

• Hash function

• Digital signature with hash function

SHA means:

• Secret Hash Algorithm

•  

  Secure Hash Algorithm

• 
  Sneaky Hash Algorithm

• Super Hash Algorithm

To check integrity of a message or document, receiver creates the :

• Cipher text

• Hash

• Hyper Text

• 
  Finger Print

How many rounds of processing uses DES?

• 14

• 15

• 16

• 17

• 
  In RSA:

• P – prime, q – any number

• P – any number, q – prime

• P,q – prime

• P,q – any numbers