Cryptography – Communication system using cryptography – Time segment interchange
Reexamination Certificate
2006-01-24
2006-01-24
Barrón, Jr., Gilberto (Department: 2132)
Cryptography
Communication system using cryptography
Time segment interchange
C380S028000
Reexamination Certificate
active
06990199
ABSTRACT:
An encryption processing system implements an encryption algorithm using a memory system comprising a multiple-port memory by performing at least one set of parallel read and write operations to the memory. The algorithm is, for example, the conventional ARCFOUR (or RC4) algorithm, and the key and state array used in the ARCFOUR algorithm are stored in the multiple port memory. During execution of the ARCFOUR algorithm, a read from one port of the multiple port memory of a state array value is done while another port is used to write a new value to the state array. The use of such parallel read and write operations uses a comparator system that determines whether to use certain previously-read values from the state array or to read a new value from the state array when selecting the pseudorandom K byte to calculate the output data byte.
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Kundarewich P. “A CPLD-based RC-4 Cracking System” 1999 IEEE Canadian Conference on Electrical and Computer Engineering, Edmonton, Alberta, Canada, May 9-12, 1999, pp. 397-402.
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Anand Satish
Parker James Darren
Barrón Jr. Gilberto
Corrent Corporation
Ingrassia Fisher & Lorenz PC
Lanier Benjamin E.
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