It's actually quite simple and readily available with PAM duress [0] (at least on Linux, I'm not sure about PAM on Mac). It was also discussed here already [1].

It's actually quite simple and readily available with PAM duress [0] (at least on Linux, I'm not sure about PAM on Mac). It was also discussed here already [1]. Still, you should consider that doing so might not work in your favor, especially if the fact that you used a duress code becomes obvious. [0] https://github.com/nuvious/pam-duress https://github.com/nuvious/pam-duress [1] https://news.ycombinator.com/item?id=28267975 https://news.ycombinator.com/item?id=28267975