Assignment: module review | Computer Science homework help

Part 1: Review Questions

1. What is the difference between authentication and authorization? Can a system permit authorization without authentication? Why or why not?
2. What is the typical relationship between the untrusted network, the firewall, and the trusted network?
3. How does a network-based IDS differ from a host-based IDS?
4. What is a VPN? Why are VPNs widely used?

Part 2: Module Practice
Create a spreadsheet that takes eight values into eight different cells and then applies a transposition cipher to them. Next, create a row that takes the results and applies a substitution cipher to them (substitute 0 for 5, 1 for 6, 2 for 7, 3 for 8, 4 for 9, and vice versa).