The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 05, 1995
Filed:
Dec. 21, 1993
Applicant:
Inventor:
Eric Sprunk, Carlsbad, CA (US);
Assignee:
GI Corporation, Hatboro, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
380 29 ; 380 45 ;
Abstract
An implementation of a security algorithm such as DES is provided that overcomes the complementarity weaknesses provided by conventional implementations. In a DES implementation, a cryptographic processor applies the DES algorithm to a data block. The DES processor includes a first input port for receiving the data block, a second input port for receiving a cryptographic key, and an output port for outputting the data block after encryption. A nonlinear function that does not have complementarity is applied to at least one of the ports. The nonlinear function can comprise a lookup table, which could be advantageously derived from a DES S-Box.