Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2008-04-01
2011-12-27
Smithers, Matthew (Department: 2437)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S180000, C713S193000, C716S104000, C380S028000, C380S030000, C380S263000
Reexamination Certificate
active
08086854
ABSTRACT:
A computer based method and apparatus to tie content protection information to recipient devices via a family of deterministic permutations of quadratic multivariate polynomial maps used for computing an HMAC (Hash Message Authentication Code) or a signed digest. This allows digital rights management (DRM) systems to customize the protection information (such as an HMAC or signed digest) for audio and video content, whereby such protection information for a piece of content differs for different recipient devices or for types of recipient devices.
REFERENCES:
patent: 2004/0133794 (2004-07-01), Kocher et al.
patent: 2008/0013716 (2008-01-01), Ding
patent: 2011107528 (2011-06-01), None
Delgosha, F.; Fekri, F.; “A multivariate key-establishment scheme for wireless sensor networks”; Wireless Communications, IEEE Transactions on vol. 8 , Issue: 4; Digital Object Identifier: 10.1109/TWC.2009.071338; Publication Year: Apr. 2009; pp. 1814-1824.
Ciet Mathieu
Farrugia Augustin J.
Fasoli Gianpaolo
Sullivan Nicholas
Apple Inc.
Fields Courtney
Morrison & Foerster / LLP
Smithers Matthew
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