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:
Sep. 07, 1999
Filed:
Sep. 28, 1995
Applicant:
Inventor:
Warwick Stanley Ford, Nepean, CA;
Assignee:
Entrust Technologies Ltd., Ottawa, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
380 28 ; 380 29 ; 380 46 ;
Abstract
Encryption frequently needs to be used in communication networks which span different geographical regions which can be considered to be trusted to different extents. According to one embodiment, the invention uses both a strong encryption algorithm and a weak encryption algorithm. A device in the high-trusted region can encrypt using the strong algorithm and can decrypt using either the strong or weak algorithm. A device in the low-trusted region can decrypt with either the strong or the weak algorithm but can encrypt only with the weak algorithm.