Patent ID: 7978850
Filing Date: 2011-07-12
Classification: G06F,H04L

Abstract:
1. A method of manufacturing a device containing a key, comprising the steps of: (A) fabricating a chip comprising a random number generator, a nonvolatile memory and a circuit; (B) applying electrical power to said chip to cause said random number generator to generate a signal conveying a sequence of random numbers; (C) commanding said chip to program a first arbitrary value among said random numbers into said nonvolatile memory, wherein said device is configured such that said first arbitrary value as stored in said nonvolatile memory is unreadable from external to said device; (D) commanding said device to program a second arbitrary value among said random numbers into a test memory of said device; (E) transferring said second arbitrary value from said test memory to an external port of said chip; (F) testing an operation in said circuit that utilizes said second arbitrary value, said testing occurring prior to commanding said chip to program said first arbitrary value into said nonvolatile memory; and (G) packaging said chip.