Kant's Anti-Torture Arguments

Emmanuel Kant was famous for saying you should not treat other people as means to an end. Another kind of anti-torture argument that's used is about the intrinsic dignity or autonomy of individuals, often with a Kantian underpinning. I think after Plato, he's the only one who thought it was necessary somehow to make perspicuous to reason. That every human being owed an unconditional respect.