Staas & Halsey
Enciphered file sharing method
 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. 
Fujitsu Limited
G G Y
G06F G06F Y10S
inventional additional additional
Hiroaki Takayuki Ryota Naoya
Kikuchi Hasebe Akiyama Torii