Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Reexamination Certificate
2008-05-27
2008-05-27
Sheikh, Ayaz (Department: 2131)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
By stored data protection
C711S162000, C711S161000, C709S213000, C713S002000, C713S189000, C713S161000
Reexamination Certificate
active
07380140
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 accessed from the protected volume (including the copy of the cleartext operating system data that is stored in the protected volume).
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Dalcher Gregory W.
Guttman Michael T.
Hoffmeier Jay H.
Sutherland Mark J.
Tran Hon
Chen Shin-Hon
Sheikh Ayaz
Sheldon Mak Rose & Anderson PC
Spyrus, Inc.
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