Enciphered file sharing method

Details Enciphered file sharing method Enciphered file sharing method

1993-12-03

1996-12-10

Black, Thomas G.

Cryptography

Key management

Having particular key generator

380 21, 380 45, 380 29, 380 49, 380 30, G06F 1500, G06F 900, G06F 904

Patent

active

055840221

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.

REFERENCES:
patent: 4203166 (1980-05-01), Ehrsam et al.
patent: 4405829 (1983-09-01), Rivest et al.
patent: 4910773 (1990-03-01), Hazard et al.
patent: 5251258 (1993-10-01), Tanaka
1990 International Symposium on Information Theory and Its Applications "ID-Based Key Management System Using Discrete Exponentiation Calculation" by Akiyama et al., Nov. 1990.

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