Hi,
Ive been looking a cheap and easy way to inplement 2 factor authentication into Captive Portal.
I came across something called Perfect Paper Passwords (PPP) by Gibson Research Corporation (
https://www.grc.com/ppp.htm ).
I looked at trying to build this into M0n0 Wall 1.231 but found too many dependencies missing, e.g. hash function, and other PHP functions.
I think it would be really good to get this feature built into Captive Portal because its a cheap and effective authentication method, and reduces the risk of brute force attacks on Captive Portal accounts.