# Compute the target hash TARGET = bytes(a ^ b for a, b in zip(K0, K1))
is likely a reference code (e.g., for a project, incident report, or technical task). Based on naming conventions: nhdta-793
Now we need a string whose SHA‑256 equals target . Because SHA‑256 is a cryptographic hash, finding a pre‑image by brute force is infeasible. But we have a : the flag format is NHDTA... – the flag is expected to be the only string that satisfies the equation. # Compute the target hash TARGET = bytes(a
SHA256(input) XOR K0 = K1 => SHA256(input) = K0 XOR K1 b in zip(K0