1. Show the step of signature generation and validation for a given binary application. The binary is signed by A and validated by B .

2. Show a detailed validation process of a certificate issue by a Sub CA as shown in the diagram below.

3.

For a Diffie Hellman key exchange between 2 users A and B show the detailed messages exchange and explain each message and event in this exchange.

The keys of A are Public Key:

The keys of B are Public Key:

How does a man in the middle attack occur in such a setup and how would you prevent such an attack?