Take a cheap Android, write the code you need for it, make it talk via USB, rip out all antennas, put it in your box (wrap in a paper bag first), and connect with USB cable to the internal USB port.
HW cost: $80 > a Trojan. Security certification concerns put aside, the > architectural demands are no more elaborate than "a CPU > unlikely to be infected by a Trojan". From there, you either > pay for the certification gimmick, or you mend your own > solution. This is the basis for an "open source HSM" ... > cryptography mailing list _______________________________________________ cryptography mailing list cryptography@randombit.net http://lists.randombit.net/mailman/listinfo/cryptography
