Edward L Witzke

US Patent:

6560727, May 6, 2003

Filed:

Oct 21, 1999

Appl. No.:

09/426073

Inventors:

Lyndon G. Pierson - Albuquerque NM
Edward L. Witzke - Edgewood NM
Joseph H. Maestas - Bosque Farms NM

Assignee:

Sandia Corporation - Albuquerque NM

International Classification:

G06F 1100

US Classification:

714704

Abstract:

A fast method for generating linear recurring sequences by parallel linear recurring sequence generators (LRSGs) with a feedback circuit optimized to balance minimum propagation delay against maximal sequence period. Parallel generation of linear recurring sequences requires decimating the sequence (creating small contiguous sections of the sequence in each LRSG). A companion matrix form is selected depending on whether the LFSR is right-shifting or left-shifting. The companion matrix is completed by selecting a primitive irreducible polynomial with 1s most closely grouped in a corner of the companion matrix. A decimation matrix is created by raising the companion matrix to the (n*k) power, where k is the number of parallel LRSGs and n is the number of bits to be generated at a time by each LRSG. Companion matrices with 1s closely grouped in a corner will yield sparse decimation matrices. A feedback circuit comprised of XOR logic gates implements the decimation matrix in hardware.

US Patent:

7257093, Aug 14, 2007

Filed:

Oct 10, 2001

Appl. No.:

09/975271

Inventors:

Edward L. Witzke - Edgewood NM, US
Perry J. Robertson - Albuquerque NM, US
Lyndon G. Pierson - Albuquerque NM, US

Assignee:

Sandia Corporation - Albuquerque NM

International Classification:

H04B 7/00

US Classification:

3703101, 455 903

Abstract:

A localized wireless communication system for communication between a plurality of circuit boards, and between electronic components on the circuit boards. Transceivers are located on each circuit board and electronic component. The transceivers communicate with one another over spread spectrum radio frequencies. An asynchronous transfer mode protocol controls communication flow with asynchronous transfer mode switches located on the circuit boards.

US Patent:

7362859, Apr 22, 2008

Filed:

Oct 4, 2001

Appl. No.:

09/970912

Inventors:

Robert J. Robertson - Albuquerque NM, US
Edward L. Witzke - Edgewood NM, US

Assignee:

Sandia Corporation - Alb NM

International Classification:

H04K 1/04
H04K 1/00

US Classification:

380 37, 380 29

Abstract:

A method of enhancing throughput of a pipelined encryption/decryption engine for an encryption/decryption process has a predetermined number of stages and provides feedback around the stages (and of such an encryption/decryption engine) by receiving a source datablock for a given stage and encryption/decryption context identifier; indexing according to the encryption/decryption context identifier into a bank of initial variables to retrieve an initial variable for the source datablock; and generating an output datablock from the source datablock and its corresponding initial variable.

US Patent:

62090771, Mar 27, 2001

Filed:

Dec 21, 1998

Appl. No.:

9/217099

Inventors:

Perry J. Robertson - Albuquerque NM
Edward L. Witzke - Edgewood NM

Assignee:

Sandia Corporation - Albuquerque NM

International Classification:

G06F9/28;13/20;13/40

US Classification:

712 17

Abstract:

A general purpose accelerator board and acceleration method comprising use of: one or more programmable logic devices; a plurality of memory blocks; bus interface for communicating data between the memory blocks and devices external to the board; and dynamic programming capabilities for providing logic to the programmable logic device to be executed on data in the memory blocks.