Simplified AES

1) Describe in detail the key generation and encryption process for Simplified AES by showing your results at each step. I have provided for you the final result.

a) Input: 16 bit key = 1010 0101 1111 0011 and 16 bit plaintext = 1000 0100 0010 0001

Details of the key generation process:

K₀ = K₁ = K₂ =

Solution:

K₀ = 1010 0101 1111 0011 K₁ = 1001 0010 0110 0001 K₂ = 1110 1010 1000 1011

Details of encryption process:

Output from Add Round Key using K₀ =

Output from Mix Columns =

Output from Add Round Key using K₁ =

Ciphertext = 0000 1100 1011 0011

b) Input: 16 bit key = 1010 0101 1111 0011 and 16 bit plaintext = 0000 1111 0000 1111

Details of the key generation process:

K₀ = K₁ = K₂ =

Solution:

K₀ = 1010 0101 1111 0011 K₁ = 1001 0010 0110 0001 K₂ = 1110 1010 1000 1011

Details of encryption process:

Output from Add Round Key using K₀ =

Output from Mix Columns =

Output from Add Round Key using K₁ =

Ciphertext = 0010 0101 1100 0100

2) Verify that using the Ciphertext from the previous questions you obtain the associated plaintext.

3) What is the output associated to the input = 1010 1010 1110 0100 after you perform the Mix Column Block?

Output =

Solution

Output = 0100 0100 1101 1001