Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Martin Langhammer0
David Jefferson0
Juju Joyce0
Keone Streicher0
Date of Patent
June 8, 2010
0Patent Application Number
110420320
Date Filed
January 25, 2005
0Patent Citations Received
Patent Primary Examiner
Patent abstract
Circuits, methods, and apparatus that prevent easy detection and erasure or modification of an encryption or encoding key. This key may be used to encode and decode a configuration bitstream for an FPGA or other programmable or configurable device. One embodiment of the present invention obfuscates a key then stores it in a memory array on an FPGA. This memory array may be a one-time programmable memory to prevent erasure or modification of the key. After retrieval from storage, a reverse or de-obfuscation is performed to recover the key. Further obfuscation may be achieved by proper layout of the relevant circuitry.
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