Sammanfattning
An electronic device requires valid control keys to change any usage restriction setting. The device is provided control keys, a secret key, and a signed software object including a batch ID and a hash of the secret key. For each control key, the device generates a cryptographic footprint bound to the device and the secret key. A message authentication code (MAC) of each usage restriction setting is generated, the MAC bound to the device and a control key. To change a usage restriction, the device receives a control key, validates it against the stored footprint, changes the usage restriction settings, and generates a new usage restriction setting MAC. The control key footprints are bound to the secret key, but the device retains only a hash of the secret key.
Originalspråk | engelska |
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Patentnummer | 8225110 |
Arkiveringsdatum | 2009/01/09 |
Status | Published - 2012 juli 17 |
Ämnesklassifikation (UKÄ)
- Datavetenskap (datalogi)