NDLI: Maximizing privacy in Variable Bit rate Coding

Content Provider	IEEE Xplore Digital Library
Author	Jiyun Yao Venkitasubramaniam, P.
Copyright Year	2013
Description	Author affiliation: ECE Dept., Lehigh Univ., Bethlehem, PA, USA (Jiyun Yao; Venkitasubramaniam, P.)
Abstract	Variable Bitrate Coding (VBR) has shown to be an advantageous method of encoding data streams, with particular application to speech, audio and video streams. While the primary disadvantage of VBR has long been considered as the increasing encoding complexity, recent research into traffic analysis of VBR coded audio streams has exposed an important privacy vulnerability wherein an eavesdropper can utilize the observed length of VBR encoded data packets and determine the contents of the communication such as spoken words and audio. In this work, the privacy-utility tradeoff for VBR coding is studied from a theoretical foundational perspective. Specifically, the data source is modeled a mixture distribution, wherein the length of the encoded data packet is varied to maintain a constant quality (distortion) with respect to the source. Using Shannon's equivocation as a measure of data privacy, the tradeoff between privacy and utility (as measured by delay and overall bit rate) of VBR is investigated analytically. In particular, the tradeoffs are expressed as classical information theoretic rate distortion functions, which shed light into methods to increase the privacy of VBR encoded data without compromising on the desired output fidelity.
Starting Page	2959
Ending Page	2963
File Size	151476
Page Count	5
File Format	PDF
ISBN	9781479903566
ISSN	15206149
DOI	10.1109/ICASSP.2013.6638200
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-05-26
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Privacy Encoding Markov processes Bit rate Data privacy Cryptography Rate-distortion rate distortion Variable bit rate coding privacy markov decision process
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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