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Cyber-Phys. Syst."],"published-print":{"date-parts":[[2019,7,31]]},"abstract":"<jats:p>\n            This article proposes new tools to detect the tampering of video feeds from surveillance cameras. Our proposal illustrates the unique\n            <jats:italic>cyber-physical<\/jats:italic>\n            properties that sensor devices can leverage for their cyber-security. While traditional attestation algorithms exchange\n            <jats:italic>digital<\/jats:italic>\n            challenges between devices authenticating each other, our work instead proposes challenges that manifest physically in the field of view of the camera (e.g., a QR code in a display). This physical (challenge) and cyber (verification) attestation mechanism can help protect systems even when the sensors (cameras) and actuators (a display, infrared LEDs, color light bulbs) are compromised. In this article, we consider skillful adversaries that can capture the correct challenges (our system is sending) and can re-create them in the response to try fooling our verification system, and we propose new algorithms to detect these powerful attackers. Also, we introduce new visual challenges that make harder for anti-forensics attackers to succeed, and we present experimental results showing how our system is robust against a variety of attacks ranging from naive attacks to more sophisticated anti-forensics attackers.\n          <\/jats:p>","DOI":"10.1145\/3331183","type":"journal-article","created":{"date-parts":[[2019,9,3]],"date-time":"2019-09-03T12:47:00Z","timestamp":1567514820000},"page":"1-26","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":4,"title":["Improving the Security of Visual Challenges"],"prefix":"10.1145","volume":"3","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4411-5419","authenticated-orcid":false,"given":"Junia","family":"Valente","sequence":"first","affiliation":[{"name":"The University of Texas at Dallas, Richardson, Texas"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kanchan","family":"Bahirat","sequence":"additional","affiliation":[{"name":"The University of Texas at Dallas, Richardson, Texas"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kelly","family":"Venechanos","sequence":"additional","affiliation":[{"name":"The University of Texas at Dallas, Richardson, Texas"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alvaro A.","family":"Cardenas","sequence":"additional","affiliation":[{"name":"University of California, Santa Cruz, California"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Prabhakaran","family":"Balakrishnan","sequence":"additional","affiliation":[{"name":"The University of Texas at Dallas, Richardson, Texas"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"320","published-online":{"date-parts":[[2019,8,31]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.5555\/882490.884210"},{"key":"e_1_2_1_2_1","unstructured":"Denso Wave Incorporated. 2015. 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