On the Security of an MPEG-Video Encryption Scheme Based on Secret Huffman Tables

Authors:
Shujun Li;Guanrong Chen;Albert Cheung;Kwok-Tung Lo;Mohan Kankanhalli
Affiliations:
Fachbereich Informatik und Informationswissenschaft, Universität Konstanz, Konstanz, Germany 78457;Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong, China;Department of Building and Construction and Shenzhen Applied R&D Centres, City University of Hong Kong, Kowloon, Hong Kong SAR, China;Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China;School of Computing, National University of Singapore, Singapore 117590
Venue:
PSIVT '09 Proceedings of the 3rd Pacific Rim Symposium on Advances in Image and Video Technology
Year:
2009

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Abstract

This paper re-studies the security of an MPEG-video encryption scheme based on secret Huffman tables. The present cryptanalysis shows that: 1) the key space of the encryption scheme is not sufficiently large against divide-and-conquer (DAC) ciphertext-only attack; 2) its security against the chosen-plaintext attack is very weak. The insecurity is mainly due to the separated use of different Huffman tables for different sets of syntax elements. A brief discussion on how to improve this MPEG-video encryption scheme is also given.