Sbox

Description

You are asked to evaluate the circuit provided (sbox.png) on the 4-bit binary value (x3, x2, x1, x0) = (1, 0, 1, 0) to find the value of y = (y3, y2, y1, y0) at the output of the circuit. The flag is FCSC{<y>}, with <y> the 4-bit binary output value.

Example: on the 4-bit input (x3, x2, x1, x0) = (1, 0, 0, 0), the output value would be (y3, y2, y1, y0) = (0, 0, 1, 1) and the flag would be FCSC{0011}.