$.$ Describe the various steps involved with encrypting and decrypting a message via an email

and a well$-$labeled diagram.

$2.$ Hackers do not need to do much of the work. All they have to do is create an algorithm or

use readily available brute force attack programs to automatically run different

combinations of usernames and passwords until they find the right combination. Explain

the brute force attack scenario with a labeled diagram indicating four types of brute force

attacks.

$3.$ Describe how a man$-$in$-$the$-$middle attack may be performed on a Wi$-$Fi network and the

consequences of such an attack.

$4.$ Explain the following attacks:

a$)$ Reflection attack

b$)$ Man$-$in$-$the$-$middle attack

$5.$ Explain Replay attack and briefly describe measures to overcome the $3$ attacks

$6.$ Block ciphers are usually designed to provide confusion and diffusion. Explain what is

meant by each of these properties, and give examples of the features of block ciphers,

which are used to provide them.

$7.$ Explain any two approaches for intrusion detection.

$8.$ Identify a few malicious programs that need a host program for their existence.

$9.$ Explain the types of Host based intrusion detection. List any two IDS software available.

$10.$ Explain firewalls and how they prevent intrusions.