2. Use the link given above to decrypt, using DES with ECB mode: (1.5 marks Key = 363898371520175e Ciphertext = dafa035909c2fc66 Plaintext in hex and in ASCII Decrypt ciphertext- dafa035909c2fchhdafa035909c2fc66 using ECB mode and the key mentioned above and give the plaintext. plaintext in ASCII) = 3. Give a URL reference that demonstrates a striking example of the degree to which ECB mode can leave plaintext dulu pallerns in the ciphertext". [1.0 marks] URL: (Hint: go to Block Cipher Modes of Operation in Wikipedia, but find a different URL then the one I showed in class.) 4. In DES, the key fed to algorithm is 64 bits but 8 of those bits are used for parity checking and 56 are actually used for encryption. Every eighth (8) bit is actually used for parity checking. In the above key used in question 2, if I change the second hex digit from 'b'to decrypted plaintext will still be the same because the encryption key will not change. Show how your answer [1.0 marks] then the correct. Using the plaintext and key of your choice, demonstrate the avalanche effect in DES. (2.0 marks key Plaintext Ciphertext1 Plaintext 2 Cipherlex 2 chungu ibits): 6. Check out the website of NIST and tell if 3DES is still secure and should be used, also checkout and explain what is sweet32 attack? [1.0 marks 7. When is/was 3DES officially being retired? [0.5 marks] Part II - AES use the cryptomathic website 8. AES is a block cipher with a block size bits, and a key size = bits.: 10.5 marks] 9. In this question, you will encrypt your name using AES. First construktobkey using S. Using the plaintext and key of your choice, demonstrate the avalanche effect in DES. 2.0 marks] key Plaintext! Ciphertext1 Plaintext2 Ciphertext2 change (bits): 6. Check out the website of NIST and tell if 3DES is still secure and should be used, also checkout and explain what is sweet32 attack? [1.0 marks] 7. When is/was 3DES officially being retired? [0.5 marks] Part II - AES - use the cryptomathic website 8. AES is a block cipher with a block size = bits, and a key size = bits. : [0.5 marks] 9. In this question, you will encrypt your name using AES. First construct an easy to remember AES key using "hexspeak (check on Wikipedia)" and then fill in the information in boxes below: (2.0 marks] Note: You can choose the key length of your choice. You can use http://des.online-domain-tools.com/ to encrypt. You can also search for another online tool if you prefer. Key in Hex Your name in ASCII Convert to hex to give plaintext = Encrypt to give ciphertext 10. Use any online tool (one link is given above.) [Decrypt] Use AES with key = 0123456789abcdef0123456789abcdef [1.0 marks) Ciphertext b9d1fdfa9631279cba49e753bfd7c83c Plain Text in hex Plain Text in ASCII