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:
Feb. 12, 1991
Filed:
Nov. 29, 1989
Stephen M Matyas, Manassas, VA (US);
Dennis G Abraham, Concord, NC (US);
Donald B Johnson, Manassas, VA (US);
An V Le, Arlington, VA (US);
Rostislaw Prymak, Dumfries, VA (US);
John D Wilkins, Somerville, VA (US);
Phil C Yeh, Poughkeepsie, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A cryptographic system and method is provided which accepts a key K encrypted under a key formed by exclusive-ORing a key-encrypting key KK with a first control vector C5 and outputs the same key K encrypted under a key formed by exclusive-ORing KK with a second control vector C6. The set (C5, C6) represents a mapping of the type and usage of the key K defined by the control vector C5 to the type and usage defined by the control vector C6. The set of allowable control vector mappings, that is from C5 to C6, are defined in a control vector translation table, which is specified in advance by authorized installation personnel.