Providing a protected volume on a data storage device
US7380140B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2005 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | Mar 21, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/78
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The invention establishes a protected volume on a data storage device associated with a computational device by allowing an operating system of the computational device to boot up to a point (the volume conversion crossover point) at which predetermined functionality of the operating system becomes available, then establishing the protected volume. A copy of the operating system data (cleartext operating system data) that is accessed during boot up prior to the volume conversion crossover point (which can be known by monitoring and recording access to operating system data during boot-up) is stored in an unprotected region of the data storage device. A copy of the cleartext operating system data is also stored in the protected volume. After the protected volume is established, the computational device is reset, causing the operating system to boot up again. During each boot-up of the operating system after the protected volume has been established, the cleartext operating system data is used until the volume conversion crossover point, at which time operation of the computational device converts to a secure mode (if authorized) in which data stored on the data storage device can be…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.