please answer this questionWhen DES is used with a weak key $K,$ then $E_K(E_K(p))=p.$

When we use a pair of keys $K_1,K_2,$ with $K_1{K}_2,$ such that $E_{K_1}(E_{K_2}(p))=p,$ then such keys are

known as semi$-$weak keys.

$($a$)$ How would you describe a pair of semi$-$weak keys in terms of the round keys they generate?

$($Your answer should provide a justification for the property of semi$-$weak keys deseribed

above$)$

$($b$)$ What is the danger of using such a key pair $K_1,K_2$ of semi$-$weak keys? Provide a detailed explanation

for your answer. $($Hint: You need to understand how does DES decryption work and then

use that knowledge in your answer.$)$