Method and system for detecting unauthorized wireless access points using clock skews
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United States of America Patent
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Jun 2, 2015
Grant Date -
Sep 15, 2011
app pub date -
Sep 11, 2009
filing date -
Sep 12, 2008
priority date (Note) -
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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.
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