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:
Apr. 23, 1996
Filed:
Aug. 04, 1994
Applicant:
Inventor:
Carlisle M Adams, Ottawa, CA;
Assignee:
Northern Telecom Limited, Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
380 29 ;
Abstract
A novel symmetric cryptographic system for data encryption using novel partially bent-function-based (m.times.n) substitution boxes (s-boxes), where m and n are positive even numbers, m<<n and m<log ##EQU1## is disclosed. A novel key schedule is used for selecting internal keys which also undergo substitution transformation by s-boxes. The s-boxes are designed on the principle that bent-function-based s-boxes possess good characteristics for encryption. The s-boxes of the invention are represented by (m.times.n) binary matrices.