Public Key Encryption

Agnes is sending a secure message to Barry. Which key should she use to encrypt the message so that only Barry can decrypt it?

• Agnes's Public Key

• Agnes's Private Key

• Barry's Public Key

• Barry's Private Key

Agnes is sending a secure message to Barry. Which key will Barry use to decrypt the message?

• Agnes's Public Key

• Agnes's Private Key

• Barry's Public Key

• Barry's Private Key

How many keys are used in asymmetric encryption?

• 2

• 1

• 0

When creating a digital signature, which key is used to encrypt the message digest?

• Sender's public key

• Sender's private key

• Receiver's public key

• Receiver's private key

How does the receiver of a message use the digital signature to verify that the message has not been tampered with?

• Decrypt the signature with the sender's public key and compare with a hash of the received message

• Decrypt the signature and unhash it to see if it is the same as the received message

• Telephones the sender to request confirmation

• Hash the encrypted digest of the received message using the private key of the sender's certification authority

Alfie's private key has been used to encrypt a message. Which key can be used to decrypt the message?

• Alfie's public key

• Alfie's private key

Encryption method using public and private keys

• Symmetric

• Asymmetric

• Vernam

• Enigma

Algorithm used for asymmetric encryption

• RSA

• MD5

• C19

• MIA

A message is hashed to create a digest. The digest is encrypted using the sender's private key to create what?

• Digital Signature

• Digital Certificate

• Electronic Signature

• Secure Connection

Two benefits of including a digital signature

• Detect unauthorised changes to message

• Authenticate sender's identity

• Only the intended recipient can decrypt the message

• Signature can be used to provide secure encryption key