Question

AES Encryption

M = 2C58FD04C2D8DB1928E11849B997044E

K = 8EF8553B444EC546F3AAAF56287AB13F

Assignment: AES Encryption This assignment familiarizes you with AES encryption. We are given a 128-bit message M 2C58FD04C2D8DB1928E11849B997044E (in hexadecimal) and a 128-bit cipher-key K 8EF8553B444EC546F3AAAF56287AB13 (also in hexadecimal). Using AES encryption scheme discussed in class, find the following values. Write your answer in hexadecimal (capital letter) without inserting any space between hexadecimal digits (for example, write "9F2C", not "9f2c" or "9F 2C") 1. In Round 1 of the encryption process, what is the (0, 0)-th element of the SubBytes matrix? 2. In Round 1 of the encryption process, what is the (3, 3)-th element of the ShiftRows matrix? 3. In Round 1 of the encryption process, what is the (0, 0)-th element of the MixColumns matrix? 4. If the expanded key is given by Wo,W1, ...,Wa3 where each W is a 32-bit word, then what is the value of W4?

Answer 1

(niveo Message o4AE Kej divide inl u words [O]-( ge, FS, 55, 3B Constant Col,00,00,00) Adding Yound M)

S-Box Matix EO B3 55 34 44 981 90 B3 55 EO 2. %,Ym9a Column medh ply boH mahi SA 44 89 90 β355eo u) W4 55,30,10,oF) (