Encryption key obfuscation and storage

Details Encryption key obfuscation and storage Encryption key obfuscation and storage

2005-01-25

2010-06-08

Zand, Kambiz (Department: 2434)

Cryptography

Communication system using cryptography

Time segment interchange

C713S001000, C713S189000

Reexamination Certificate

active

07734043

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.

REFERENCES:
patent: 4598170 (1986-07-01), Piosenka et al.
patent: 4812675 (1989-03-01), Goetting
patent: 6212639 (2001-04-01), Erickson et al.
patent: 6996713 (2006-02-01), Trimberger
patent: 7028191 (2006-04-01), Michener et al.
patent: 7197647 (2007-03-01), Van Essen et al.
patent: 7299203 (2007-11-01), Nelson
patent: 7325141 (2008-01-01), Chow et al.
patent: 2002/0114455 (2002-08-01), Asahi et al.
patent: 2002/0145931 (2002-10-01), Pitts
patent: 2002/0199110 (2002-12-01), Kean
patent: 2004/0186991 (2004-09-01), Kobayashi et al.
patent: 2005/0113070 (2005-05-01), Okabe
Office Action from U.S. Appl. No. 11/435,416 dated Sep. 19, 2007.
Office Action from U.S. Appl. No. 11/435,416 dated Mar. 26, 2008.
Hoflich, Wolfgang; “Using the XC4000 Readback Capability”;Xilinx XAPP 015.000, http://xgoogle.xilinx.com/search?q=XAPP%20015.000&spell=1&filter=0&access=p&output=xml—no—dtd&ie=UTF-8&client=xilinx&site=EntireSite&oe=UTF-8&proxystylesheet=xilinx, pp. 8-37 thru 8-44, downloaded on Mar. 6, 2006.
Office Action from U.S. Appl. No. 11/042,019 dated Oct. 21, 2008.
Office Action from U.S. Appl. No. 11/042,937 dated Nov. 28, 2008.

Affiliated with

Also associated with

Rating

Encryption key obfuscation and storage does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Encryption key obfuscation and storage, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Encryption key obfuscation and storage will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4173297