A) Write a C/C++ program to compute the linear approximation table for this S-box.

B) Find a linear approximation using three active S-boxes and use the piling-up lemma using c/c++

Sround 1 ?K2 5 round 2 round 3 OK 4 round 4 st ciphertext Figure 1: Substitution-permutation-network (SPN) Sround 1 ?K2 5 round 2 round 3 OK 4 round 4 st ciphertext Figure 1: Substitution-permutation-network (SPN)