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:
Dec. 10, 1996
Filed:
Dec. 03, 1993
Hiroaki Kikuchi, Kawasaki, JP;
Ryota Akiyama, Kawasaki, JP;
Naoya Torii, Kawasaki, JP;
Takayuki Hasebe, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An enciphered file sharing method is adapted to an area distributed type data processing system in which a plurality of data processing units are coupled via a network and a plurality of users share files while maintaining privacy among the users. The enciphered file sharing method includes the steps of (a) enciphering files using a cipher key and storing enciphered files in directories having a hierarchical tree structure in at least a first data processing unit which functions as a file server, (b) enciphering files having the same access attribute by the same cipher key by assigning one cipher key to each of the directories, and (c) transferring the enciphered files in the network and locally deciphering the enciphered files in at least a second data processing unit which is used by one of the users, where the second data processing unit is different from the first data processing unit.