Problem:

Describe the answer of both the questions:

Question 1: Describe how a long number (encryption key) can be shared between sender and receiver without using any source that is obvious to outsiders and without directly sending the number from sender and receiver.

Question 2: Describe how a long number (encryption key) can be shared between sender and receiver over an unsecured network without loss of confidentiality.

Could someone help to explain the answer of these questions.