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AssigneeIntertrust Technologies Corporation
InventorsVictor H. Shear, W. Olin Sibert, David M. Van Wie
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Secure computation environments are protected from bogus or rogue load modules, executables and other data elements through use of digital signatures, seals and certificates issued by a verifying authority. A verifying authority—which may be a trusted independent third party—tests the load modules or other executables to verify that their corresponding specifications are accurate and complete, and then digitally signs the load module or other executable based on tamper resistance work factor classification. Secure computation environments with different tamper resistance work factors use different verification digital signature authentication techniques (e.g., different signature algorithms and/or signature verification keys)—allowing one tamper resistance work factor environment to protect itself against load modules from another, different tamper resistance work factor environment. Several dissimilar digital signature algorithms may be used to reduce vulnerability from algorithm compromise, and subsets of multiple digital signatures may be used to reduce the scope of any specific compromise.
A method performed by an electronic appliance comprising a protected processing environment, the protected processing environment comprising a plurality of processing environments, the method comprising the steps of:
A computer-readable medium comprising program code, the program code being operable, when executed by an electronic appliance comprising a protected processing environment that is resistant to tampering by users of the electronic appliance, the protected processing environment comprising a plurality of processing environments, to cause the electronic appliance to perform steps comprising:
A system comprising:
Dependencies are inferred from the claim text.