Question Details

Questions 62-68• M = M0 = 3124 is the message
• K = K0 = 172 is the key
62. What are the subkeys K1, K2, and K3? Write your answers in decimal form.1
If you solve the
problem by hand, show your work. If you wrote your own code, include your code.
63. What are the values of L0 and R0 formed from the original message? (In decimal!)
64. What is E(R0) (in decimal), where E is the expander function?
65. What is K1 ⊕ E(R0) (in decimal) where the subkey is XORed with the expanded R0?
1Why in decimal? Imagine trying to grade 30 assignments with all of the numbers in binary. The odds that I would
get them all right are 1 in 0b1001000111001010100.
66. What is f(R0, K1) (in decimal)?
67. What is the value of R1 = L0 ⊕ f(R0, K1) (in decimal)?
68. What is the value of M1 formed from L1 and R1?