Method of distributing computer data files

Details Method of distributing computer data files Method of distributing computer data files

1990-08-09

1991-10-15

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

364200, 364900, 380 4, H04K 100, H04K 900, H04L 900

Patent

active

050581627

ABSTRACT:
A method of distributing a plurality of data files to a plurality of recipients including the steps of: placing encrypted copies of the data files to be distributed on a plurality of identical media and providing the recipients with media reading devices having data file decryption capability; logically arranging the data files into data file groups; in response to a recipient's request for access to selected file groups providing the recipient with a group access map indicative of the file groups to which access is requested; in further response to a recipient's request for access to selected file groups providing the recipient with a password to be used for access verification; completing an access verification operation using the group access map and the password and data indicative of the media being read and data indicative of the reading device being used; providing access to the data files in the file groups to which access is requested by use of the group access map; and decrypting the accessed data files.

REFERENCES:
patent: 3670310 (1972-06-01), Bharwami
patent: 4604686 (1986-08-01), Reiter et al.
patent: 4757533 (1988-07-01), Allen et al.

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