Two users Ahmed and Abdullah are trying to communicate through a chat application like whatsapp. a. What authentication method will they use to authenticate them with the other person? b. Explain how...

Two users Ahmed and Abdullah are trying to communicate through a chat application like whatsapp.

a. What authentication method will they use to authenticate them with the other person?

b. Explain how the authentication method used by the chat application is different from the authentication method used in email systems.