Question Solved1 Answer solving using cryptool Assignment #1: Problem 1: Compare DES and AES in terms of Key Size(s) ], I Keyspace 1, Plaintext Block Size 1, I Ciphertext Block Size ), and Security Level). 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?

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solving using cryptool
Transcribed Image Text: Assignment #1: Problem 1: Compare DES and AES in terms of Key Size(s) ], I Keyspace 1, Plaintext Block Size 1, I Ciphertext Block Size ), and Security Level). 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?
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Transcribed Image Text: Assignment #1: Problem 1: Compare DES and AES in terms of Key Size(s) ], I Keyspace 1, Plaintext Block Size 1, I Ciphertext Block Size ), and Security Level). 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?
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Answer: Solution 1:  tThe basic difference between DES and AES is that the block in DES is divided into two halves before further processing whereas, in AES entire block is processed to obtain ciphertext. tThe DES algorithm works on the Feistel Cipher principle, and the AES algorithm works on substitution and permutation principle. tThe key size of DES is 56 bit which is comparatively smaller than AES which has 128,192, or 256-bit secret key. tThe rounds in DES include Expansion Permutation, Xor, S-box, P-box, Xor and Swap. On th ... See the full answer