This is a simple cipher to linear S-box: P2 P1 Po +) kz k, ko X2 X1 Xo 3 x 3 S-box Co = Xo O X1 C1 = Xo O C2 = X1 O X2 X2 S-box C2 C1 Co Solve the three unknows k0, k1, k2, we get: k1 = (P1) ☺ (co ® cj ® c2) k2 = (p2) (co ci) (Po) ☺ (c1 ® c2) %3D ko =

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