Content protection and authentication without secret keys

Details Content protection and authentication without secret keys Content protection and authentication without secret keys

2003-04-01

2009-02-10

Zand, Kambiz (Department: 2134)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

Reexamination Certificate

active

07490249

ABSTRACT:
A clearinghouse authorizes a content provider to use a scrambler to scramble content using a content ID. The content provider provides the scrambled content to a content consumer. If the content consumer has a valid authorization, it can use a content descrambler and the content ID to descramble and access the content. Authorization takes the form of a electronically signed authority message including a device ID and the content ID. The authorization is valid for the content consumer if the device ID matches a corresponding value in the descrambler. The scrambler implements an irreducible scrambling function that can be performed quickly in special-purpose hardware but not on general purpose hardware or software. The scrambler and descrambler can also be used to authenticate the content consumer.

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Maurer, Ueli M. et al., “Cascade Ciphers: The Importance of Being First”, Journal of Cryptology, vol. 6, No. 1, pp. 55-61, 1993.

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