| US 7,571,329 B2 | ||
| Method of storing unique constant values | ||
| Ernie F. Brickell, Portland, Oreg. (US); Alberto J. Martinez, El Dorado Hills, Calif. (US); David W. Grawrock, Aloha, Oreg. (US); James A. Sutton, II, Portland, Oreg. (US); and Clifford D. Hall, Orangevale, Calif. (US) | ||
| Assigned to Intel Corporation, Santa Clara, Calif. (US) | ||
| Filed on Jul. 14, 2004, as Appl. No. 10/891,699. | ||
| Prior Publication US 2006/0015751 A1, Jan. 19, 2006 | ||
| Int. Cl. G06F 12/14 (2006.01); G06F 11/30 (2006.01) | ||
| U.S. Cl. 713—193 [713/167] | 21 Claims |
| 1. A method comprising:
obtaining a unique value associated with a device of a processing system, via the unique value the device is identifiable;
and
securely storing the unique value in the processing system without exposing outside the device a unique identifier of the
device, wherein securely storing the unique value comprises
generating an encryption key based at least in part on a secret value securely stored in the device;
generating an initialization vector having a plurality of pseudo-randomly or randomly generated bits;
encrypting the unique value associated with the device using both the encryption key and the initialization vector as inputs
to form an encrypted data structure;
storing the encrypted data structure in a memory of the processing system that is external to the device; and
periodically replacing the encrypted data structure with a modified encrypted data structure formed from encrypting the unique
value using both the encryption key and a new initialization vector having a plurality of pseudo-randomly or randomly generated
bits, wherein
periodically replacing the encrypted data structure occurs every N accesses of the unique value by the device, where N is
a positive integer.
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