Now I seem to understand what you mean by 'grid of codes' -- I was thinking of a list of one-time passwords. But if I understand you correctly, you are referring to something like
Code:
|| 1 | 2 | 3 | ...
=================
A || a | b | c | ...
-------------------
B || d | e | f | ...
-------------------
C || g | h | h | ...
-------------------
................
In case of a 15x15 grid, there would be 225 random characters.
There could then be two login options: 'Normal' with your normal password (from a trusted computer) and 'Secure' with a second, static password plus 8 random chars from your grid as requested by the web interface, i.e. one would enter MyStaticPassWhichIsNotMyNormalPass + A3;C12;F2;[...].
@RB: Do you think it's feasible to implement something like this in the near future?
Regards,
gecko