Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Reexamination Certificate
2009-06-19
2011-11-22
Chai, Longbit (Department: 2431)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
By stored data protection
C713S176000, C713S177000, C713S178000, C713S179000, C380S278000, C380S279000, C380S280000, C380S281000
Reexamination Certificate
active
08065533
ABSTRACT:
A method of and device for granting access to content on a storage medium, including obtaining cryptographic data from a property, such as a wobble, of the storage medium, reading helper data from the storage medium, and granting the access based on an application of a delta-contracting function to the cryptographic data and the helper data. The delta-contracting function allows the choice of an appropriate value of the helper data, such that any value of the cryptographic data which sufficiently resembles the original primary input value leads to the same output value. Substantially different values of the cryptographic data lead to different values of the output.
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Chai Longbit
Intrinsic ID B.V.
Thorne Gregory L.
Thorne & Halajian, LLP
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