| US 7,451,325 B2 | ||
| Methods, systems and computer program products for detecting tampering of electronic equipment by varying a verification process | ||
| Jeffrey A. Aaron, Atlanta, Ga. (US) | ||
| Assigned to AT&T Intellectual Property I, L.P., Reno, Nev. (US) | ||
| Filed on Aug. 02, 2004, as Appl. No. 10/909,484. | ||
| Prior Publication US 2006/0026441 A1, Feb. 02, 2006 | ||
| Int. Cl. G06F 11/30 (2006.01) | ||
| U.S. Cl. 713—187 [726/34] | 26 Claims |
| 1. A method of detecting tampering of electronic equipment, the method comprising:
dividing a known software image into a plurality of software image portions;
arranging the software image portions in a first ordering;
instructing the electronic equipment to perform a first sequence of hashing algorithms on the plurality of software image
portions according to the first ordering to provide a sequence of first hash results, wherein a respective first hash result
corresponds to a respective hashing algorithm of the first sequence and a respective software image portion of the first ordering;
detecting tampering if the sequence of first hash results is not provided within a first timeout period;
arranging the software image portions in a second ordering different from the first ordering;
instructing the electronic equipment to perform a second sequence of hashing algorithms different from the first sequence
on the plurality of software image portions according to the second ordering to provide a sequence of second hash results,
wherein a respective second hash result corresponds to a respective hashing algorithm of the second sequence and a respective
software image portion of the second ordering; and
detecting tampering if the sequence of second hash results is not provided within a second timeout period.
|