Electrical computers and digital processing systems: support – Data processing protection using cryptography
Reexamination Certificate
2007-02-27
2007-02-27
Arani, Taghi T. (Department: 2131)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
C713S165000, C713S166000, C713S190000, C707S793000, C707S793000
Reexamination Certificate
active
10108176
ABSTRACT:
The present invention relates to pairing of a different cryptographic key with each pointer in a data structure to form a crypto-pointer. The cryptographic key is used to encrypt the contents of all data stored at the physical location on the storage device indicated by the pointer. Preferably the only data accessible in an unencrypted form is contained in cells that are reachable from root-set crypto-pointers. Once the crypto-pointer associated with a particular memory cell is deleted, normally by overwriting or explicitly zeroing the crypto-pointer, the contents of the memory cell become inaccessible because the data stored at that cell is in encrypted form (cipher text) and the crypto-pointer that included the cryptographic key for decrypting the cipher text has been deleted from the system.
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Launchbury John
Nordin Thomas
Arani Taghi T.
Galois Connections, Inc.
Stoel Rives LLP
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