29 citations · 92 across the 15 of their papers we have counts for
5 papers · 2 filters
A Secure Mobile Authentication Alternative to Biometrics
Mozhgan Azimpourkivi, Umut Topkara, Bogdan Carbunar
Biometrics are widely used for authentication in consumer devices and business settings as they provide sufficiently strong security, instant verification and convenience for users…
Camera Based Two Factor Authentication Through Mobile and Wearable Devices
Mozhgan Azimpourkivi, Umut Topkara, Bogdan Carbunar
We introduce Pixie, a novel, camera based two factor authentication solution for mobile and wearable devices. A quick and familiar user action of snapping a photo is sufficient for…
Video Liveness for Citizen Journalism: Attacks and Defenses
Mahmudur Rahman, Mozhgan Azimpourkivi, Umut Topkara +1
The impact of citizen journalism raises important video integrity and credibility issues. In this article, we introduce Vamos, the first user transparent video "liveness" verificat…
Secure Management of Low Power Fitness Trackers
Mahmudur Rahman, Bogdan Carbunar, Umut Topkara
The increasing popular interest in personal telemetry, also called the Quantified Self or "lifelogging", has induced a popularity surge for wearable personal fitness trackers. Fitn…
Hardening Stratum, the Bitcoin Pool Mining Protocol
Ruben Recabarren, Bogdan Carbunar
Stratum, the de-facto mining communication protocol used by blockchain based cryptocurrency systems, enables miners to reliably and efficiently fetch jobs from mining pool servers.…