Two monitors at the same time, friend.
In seriousness, I'd be careful because as others have pointed out, some crypto systems would be vulnerable.
In seriousness, I'd be careful because as others have pointed out, some crypto systems would be vulnerable.
NP is nice for crypto since it has P time checkable solutions - so just make the "password" an encoding of the solution and you're golden.
It's easy to check that a password is correct, and it takes EXP time to brute force. Hopefully the crypto implementation blocks IPs after some number of login attempts that is less than EXP :)