Patent ID: 7711964
Filing Date: 2010-05-04
Classification: H04L,Y04S

Abstract:
1. A system comprising: a circuit board; an integrated circuit package connected to said circuit board, said package having a plurality of input pins; and a programmable logic device integrated circuit packaged in said integrated circuit package, said integrated circuit having a plurality of input conductors and operative to perform cryptographic calculations employing a cryptographic key, whereby said cryptographic key is provided to said programmable logic device integrated circuit via a binary code applied to a predetermined plurality of said input conductors, said binary code being inaccessible when said system is deployed; wherein a predetermined plurality of said programmable logic device integrated circuit input conductors is connected to an active high voltage level or signal ground to form said binary code; wherein said predetermined plurality of conductors is not connected to said integrated circuit package input pins; wherein a predetermined plurality of said programmable logic device integrated circuit input conductors is connected to a predetermined plurality of said integrated circuit package input pins; said predetermined plurality of said integrated circuit package input pins is connected via said circuit board to an active high voltage level or signal ground to form said binary code; and at least said predetermined plurality of said integrated circuit package input pins is inaccessible when said system is deployed.