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:
Nov. 06, 1990
Filed:
Feb. 04, 1988
Applicant:
Inventor:
Paul J Schobi, Zurich, CH;
Assignee:
GRETAG Aktiengesellschaft, Regensdorf, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
380 23 ; 380 24 ; 380 25 ;
Abstract
Each encryption device of a communication network is divided into a base part and a security module in credit card form. The security module contains the functional stages required for the coding/decoding of the keys of lower hierarchical levels under keys of higher hierarchical levels and thus the secret elements of the network. The base parts contain no secret elements. The secret elements are stored in the security module preferably in a cryptologically secured form. A password also provided therein secures it against unauthorized use.