Method for the secure distribution of electronic files in a dist

Details Method for the secure distribution of electronic files in a dist Method for the secure distribution of electronic files in a dist

1995-08-28

1997-06-10

Tarcza, Thomas H.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 30, 380 23, H04L 932, H04L 930

Patent

active

056384467

ABSTRACT:
A process for using a trusted third party to create an electronic certificate for an electronic file that can be used to establish the file and verify the identity of the creator of the file. The process is composed of two phases, a registration phase and an electronic file distribution phase. In the registration phase, a trusted third party receives information about an author, including the author's public key and affirmatively verifies the accuracy of this information. In the file distribution phase, an author sends to the trusted third party a signed message containing the hash of the file the author wants to distribute. The trusted third party creates an electronic certificate, signed by the trusted third party, containing the hash of the file sent by the author. A user desiring to receive the file, retrieves the file with the certificate an uses the certificate to verifies, first, that the certificate was created by the trusted third party, and, second, that the hash of the file in the certificate is the same as the hash that is computed from the retrieved file. If these two hash's match, then the user is assured that the file did originate with the author and is uncorrupted.

REFERENCES:
patent: 5005200 (1991-04-01), Fischer
patent: 5136647 (1992-08-01), Haber
patent: 5373561 (1994-12-01), Haber
patent: 5420927 (1995-05-01), Micali
J. G. Steiner, C. Neuman, J. I. Schiller, Kerberos: An Authentication Service for Open Network Systems, USENIX Winter Conference, Feb. 9-12, 1988, Dallas Texas, pp. 191-202.

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