A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is
We propose a new way to verify the integrity and freshness of footage from security cameras by sending visual challenges to the area being monitored by the camera. We study the effectiveness of periodically updating plain text and QR code visual challenges, propose attack detection statistics for each of them, and study their performance under normal conditions (without attack) and against a variety of adversaries. Our implementation results show that visual challenges are an effective methoddoi:10.1145/2818000.2818045 dblp:conf/acsac/ValenteC15 fatcat:4aszhvl3zzdcrgfoasr2leifxm