Plaintext for DES: 02468aceeca86420 Key for DES: 0f1571c947d9e859 

a. (10 Point) Derive K1, the first round subkey. 

b. (10 Point) Derive and . 

c. (10 Point) Expand to get E( ), where E( ) is the expansion table of Table 15 on the lecture note. 

d. (10 Point) Calculate A = E( )  . 

e. (10 Point) Group the 48 bit result of (d) into sets of 6 bits and evaluate the corresponding S-box substitutions. 

f. (10 Point) Concatenate the results of (e) to get a 32-bit result, B. 

g. (10 Point) Apply the permutation to get P(B). 

h. (10 Point) Calculate = P(B)  . 

i. (20 Points) Write down the ciphertext. 

Hint: 1) Please show the work to earn credits. 

2) Please use DES.ipynb in An