COMP3 - Security

Question 0

Digital Signature Purpose

Answer 0

To authenticate the identity of the sender

To detect if a message has been tampered with or changed

Question 1

Encryption

Answer 1

Using an algorithm to convert message data into a form that is not understandable without a key to decrypt the text

Question 2

Digital Signature How it is Used

Answer 2

Hash produced from message
Hash encrypted with private key
Encrypted hash known as digital signature
Signature added to message
Received message and signature decrypted with public key
Message re-hashed or Hash calculated from message