Offline data access using trusted hardware
US8972732B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2012 |
| Grant date | Mar 3, 2015 |
| Priority date | — |
| Expiry date | May 17, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/60
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A cryptographically-secure component provides access-undeniability and verifiable revocation for clients with respect to downloaded content items from a server. A cryptographically-secure component is implemented in a client. When the client wants to purchase and download a content item from the server, the server requests an encryption key from the client. The client generates an encryption key that is bound to a state of the client that is associated with decrypting the content item. The server encrypts the content item using the encryption key and sends the encrypted content item to the client. Because the encryption key used to encrypt the content item is bound to the state associated with the client decrypting the content item, if the client desires to view the content item the client may first advance its state to the bound state to retrieve the decryption key.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.