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. 07, 2000
Filed:
Jan. 27, 1998
Applicant:
Inventors:
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
380232 ;
Abstract
For warranting a validity of data recorded on a medium such as a rewritable magneto-optic disk etc, when registering a plurality of documents (n, n+1 . . . ) on the same recording medium, an n-th authenticator obtained by executing an encrypting process of data of the n-th document is recorded together with the n-th document data, and, when registering data of the (n+1)th document, an (n+1)-th authenticator is generated by executing the encrypting process of the n-th authenticator and the (n+1)-th document data as the (n+1)th authenticator.