ISP - 1tron1/Project-KeyStone GitHub Wiki
The Internet Security Protocol
Written in Perl:
while ($text=<STDIN>) { chomp($text); eval=sin($text)
is the basic mechanism. Essentially both the server and the Stone communicate over a network, and ping and use the future time of the ping in order to calculate the value of a repeating function, thus an infiltrator must know of both the time and the previous function state.