System for securely storing and reading encrypted data on a data

Details System for securely storing and reading encrypted data on a data System for securely storing and reading encrypted data on a data

1997-05-16

1999-12-21

Laufer, Pinchus M.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 4, 380 48, 380 20, 360 60, H04L 900

Patent

active

060059400

ABSTRACT:
A self contained data medium is provided with an apparatus for generating a decrypting key for decrypting stored data. Frames of encrypted data are stored on the data medium such as a video or audio disk. Each frame of data includes a header which has a frame identification number. A reader reads each frame of data including the header with the frame identification number. The reader transmits the frame number to a transponder attached to the data medium. The transponder includes a decryption engine which calculates a decryption key from the frame number and a secret deciphering key stored in the transponder. The transponder transmits the decryption key to the reader which uses the decryption key to decrypt the frame of data. The system discourages both home copying and commercial piracy of the underlying program material.

REFERENCES:
patent: 4388643 (1983-06-01), Aminetzah
patent: 4535355 (1985-08-01), Arn et al.
patent: 5629981 (1997-05-01), Nerlikar
patent: 5905798 (1999-05-01), Nerlikar et al.

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