Use Cryptool

Problem 2: In CrypTool, do the following (and take screenshots for each step): a) Write a plaintext message. This can be random sentences, your favorite poem, a recipe, etc. b) Encrypt the plaintext with AES using a 128-bit key. Do not change the key value keep it 000...00 c) At the menu bar on the top of your screen, click on Analysis Modern Symmetric AES. d) Begin the Brute Force process. e) Note down how long is needed to break the cipher and immediately click cancel. Review the window that pops up afterwards. Is your message seen in any of the attempts? Problem 3: Repeat Problem 2, but with 192- and 256-bit keys. Does the time taken to Brute Force the ciphertext increase or decrease? By how much? Take screenshots of each attempt. Problem 4: Based on the results of Problems 2 and 3, what can you say about the security level of AES? Do you think it can ever be broken