公开(公告)号：US20180091523A1

公开(公告)日：2018-03-29

申请号：US15716389

申请日：2017-09-26

Applicant: Avast Software s.r.o.

Inventor： Ondrej Planý

IPC: H04L29/06 ,  H04W4/00 ,  H04W4/02 ,  G06K9/32

CPC classification number: H04L63/107 ,  G06K9/183 ,  G06K9/22 ,  G06K9/3216 ,  H04L63/08 ,  H04W4/023 ,  H04W4/80 ,  H04W12/0023 ,  H04W12/003 ,  H04W12/00522 ,  H04W12/06 ,  H04W12/08

Abstract: A computing device can initiate a pairing operation with mobile computing device. The computing device encodes a pairing secret into a displayable code for presentation. The size of the displayable code can be determined in accordance with a threshold distance and display parameters. The mobile computing device is positioned such that an image of the displayable code substantially fills a boundary whose size is determined according to a desired threshold distance, a focal length, and parameters of a sensor chip. The displayable code is decoded to reveal the pairing secret to the mobile computing device. The pairing secret is used to complete the pairing process with the computing device. Once pairing has been completed, the computing device can measure a signal strength between the computing device and the mobile computing device. The signal strength can be stored to be used for later authorization purposes.