This is an overview poster on recent research of using power frequency signatures to determine/verify the time, location and integrity of audio-visual recordings and other sensing data.

For more info, please check out our recent publications:

R. Garg, A.L. Varna and M. Wu, " 'Seeing' ENF: Natural Time Stamp for Digital Video via Optical Sensing and Signal Processing," ACM Multimedia 2011, Best Student Paper Award. [17% acceptance]. An updated and expanded version appeared in IEEE Trans. on Info. Forensics & Security in the Sept. 2013 issue. <http://dx.doi.org/10.1109/TIFS.2013.2272217>