Question

You are building a safe messaging system by using an Encryption such as private key (symmetric) and public key (Asymmetric) that would prevent the utility company from knowing the content of the communications being exchanged.

The receiver can be disconnected and cannot receive messages, how can this situation be managed by your system?

Answer 1

• In order to manage such a situation, we can use a protocol like automatic repeat request within the system.
• It will help to know whether the message that is sent by the sender has been received by the receiver.
• If the receiver receives the message, the receiver sends an acknowledgment to the sender that the message has been successfully received.
• There will be a timer on the side of the sender if the acknowledgment is not received within a time, the timer will timeout.
• Then the sender will come to know that the message is not received by the receiver.
• Whether the receiver got disconnected, or the message is not received by the receiver.
• Then the sender resends the message again to the receiver.
• If the sender gets an acknowledgment from the receiver, the sender send s the next message.
• That is the sender waits to send the next message until it receives the acknowledgment from the receiver.
• By using this, the sender can know whether the receiver gets the message or not.