Question $01)$: Recall the functional details of DES. Will the security of DES algorithm be compromised if the Pbox is removed from the DES algorithm? Why or why not?

Question $02)$: How does the Cipher Block Chaining $(CBC)$ overcome the drawback of Electronic Code Book $($ECB$)?$ Also, explain how $CBC$ recovers from errors in transmission.

Question $03.$a$)$: Write an algorithm for encryption using RSA.

b$)$ Differentiate between signature based IDS and Anomaly based IDs. Which one is better than the other in term of false alarm rate?

Question $04.$a$)$: Differentiate Encrypt first then Sign vs Sign first and then Encrypt. Is the order really matter???

b$),$SIK$=(2,3,7,14,30,57,120,251)$

PlainText $=10010110$

Encrypt the plaintext into CipherText by using the SIK and Knapsack Algorithm.

Question $05$: Write all the implementation steps of MD$5$ algorithm. Also explain the following figure that represents a single round of MD$5$ Hash.