The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 02, 2015
Filed:
Sep. 11, 2009
Suman Jana, Austin, TX (US);
Sneha Kasera, Salt Lake City, UT (US);
Suman Jana, Austin, TX (US);
Sneha Kasera, Salt Lake City, UT (US);
University of Utah Research Foundation, Salt Lake City, UT (US);
Abstract
Identifying valid wireless access points based on clock skews. A computing device receives plurality of frames, each including a corresponding timestamp, from a wireless access point. The computing device calculates transmit and receive offsets based on transmit and receive times of the plurality of frames, and also calculates differences between the transmit and receive offsets. The computing device also calculates a clock skew of a clock at the wireless access point based on a slope of the differences. The client computing device determines whether the wireless access point is an authorized wireless access point or an unauthorized wireless access point based on comparing the calculated clock skew with one or more known baseline clock skews of one or more authorized wireless access points.