Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Protection at a particular protocol layer
Reexamination Certificate
1997-09-05
2001-01-16
Beausoliel, Jr., Robert W. (Department: 2785)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Protection at a particular protocol layer
C713S190000, C713S194000
Reexamination Certificate
active
06175925
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the field of system security. More specifically, the present invention relates to a tamper resistant player for scrambled contents.
2. Background Information
Content management, such as management of scrambled DVD contents, require the basic integrity of the management operations to be assumed, or at least verified. While a number of security approaches such as encryption and decryption techniques are known in the art, unfortunately, the security approaches can be readily compromised, because these applications and the security approaches are implemented on systems with an open and accessible architecture, that renders both hardware and software including the security approaches observable and modifiable by a malevolent user or a malicious program.
Thus, a system based on open and accessible architecture is a fundamentally insecure platform, notwithstanding the employment of security measures. However, openness and accessibility offer a number of advantages, contributing to these systems' successes. Therefore, what is required are techniques that will render the operations of a scrambled content player, such as a DVD player, virtually unobservable or unmodifiable on these fundamentally insecure platforms, notwithstanding their openness and accessibility.
SUMMARY OF THE INVENTION
In one apparatus, a group of plain text and obfuscated cells of programming instructions is provided to implement a descrambler that descrambles scrambled content to generate descrambled content.
In another apparatus, a group of plain text and obfuscated cells of programming instructions is provided to implement an authenticator that provides appropriate authentication challenges to a scrambled content provider, and generates appropriate authentication responses to authentication challenges from the scrambled content provider.
In yet another apparatus, a group of plain text and obfuscated cells of programming instructions is provided to implement an integrity verifier that performs integrity verification on a decoder.
In yet another apparatus, a group of plain text and obfuscated cells of programming instructions is provided to implement a secrets holder that holds a number of secrets associated with playing scrambled contents. In one embodiment, the secrets include secrets used in a mutual authentication process, and the secrets used for descrambling the scrambled content.
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Aucsmith David W.
Graunke Gary L.
Maliszewski Richard L.
Mangold Richard P.
Nardone Joseph M.
Baderman Scott T.
Beausoliel, Jr. Robert W.
Blakely , Sokoloff, Taylor & Zafman LLP
Intel Corporation
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