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:
Jun. 25, 1991
Filed:
May. 07, 1990
Applicant:
Inventors:
Dale T Platteter, Fairport, NY (US);
Robert S Westfall, Rochester, NY (US);
Jeff C Carter, Fairport, NY (US);
Assignee:
Xerox Corporation, Stamford, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
380-4 ; 380-3 ; 360 60 ;
Abstract
The method of permitting the execution of a disk loaded into the disk drive, the disk having a plurality of tracks, comprising the steps of writing data in non-standard format and length to a normally unaccessible track of the disk, the data including an encrypted password, the password being located at an arbitary location within the data, reading the data resulting in an error signal, locating an indexing position and applying an offset to identify the password, and unencrypting and authenticating the password in order to execute the disk.