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US 2019/0260720 A1Published application
Key Derivation for Secure Communications
AssigneeComcast Cable Communications, LLC
InventorsJames W. Fahrny, Pete Kuykendall, Nancy Davoust
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Abstract
A security system is disclosed in which a device-specific key value is provided to a security processing device, and then used to derive additional derived keys for use in secured communications. In response to identifying a compromise of the derived keys, the system can be instructed to derive new or replacement derived keys for use in the secured communications. In some embodiments, the security system can be used in a video reception device, to decrypt encrypted video content.
Claims1
A security device, comprising:
- a first memory storage storing a device security key;
- and
- a first processor configured to:
- encrypt the device security key using a first seed value to derive a first derived key, and store the first derived key in a second memory storage area of the device;
- and
- in response to a compromise of the first derived key, re-encrypt the device security key using a second seed value to derive a second derived key, and store the second derived key in the second memory storage of the device.
3 more elements
Dependencies are inferred from the claim text.