CERIAS Weekly Security Seminar – Purdue University

Nitin Khanna, Forensics Characterization of Printers and Image Capture devices

43 min • 18 oktober 2006

The falling cost and wide availability of electronic devices have led to theirwidespread use by individuals, corporations, and governments. These devices,such as computers, cell phones, digital cameras, and printers, all containvarious sensors which generate data that are stored or transmittedto another device. One example of this is a security system containing anetwork of video cameras, temperature sensors, alarms, computers, and otherdevices. In such a network, it is important to be able to trust the data fromeach of these sensors. Forensic techniques can be used to uniquely identifyeach device using the data it produces. This is different from simply securingthe data being sent across the network because we are also authenticating thesensor that is creating the data.Forensic characterization of a device allows identification of the type ofdevice, make, model, configuration, and other characteristics based solely onobservation of the data that the device produces. These characteristicsthat uniquely identify a device are called device signatures. As an example,the noise characteristics in a digital image can be used as a signature of thecamera that produced it. Similarly, the ‘‘noise'' characteristics of a printengine can be used as a signature of the printer that generated a document.This talk will present current research and techniques for forensiccharacterization of printers and image capture devices such as digitalcameras and scanners. About the speaker: Nitin Khanna is a PhD candidate in Electrical and Computer Engineering at PurdueUniversity, after finishing his Bachelor of Technology at IIT Delhi,India, in 2005. He is currently working on image forensics for digital camerasand scanners. His research interests are in image processing and multimediasecurity.

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