EURASIP Journal on Information Security 
Volume 2008 (2008), Article ID 895174, 18 pages
doi:10.1155/2008/895174
Research Article

Key-Dependent JPEG2000-Based Robust Hashing for Secure Image Authentication

Gerold Laimer and Andreas Uhl

 Department of Computer Sciences, University of Salzburg, Jakob-Haringerstaße 2, 5020 Salzburg, Austria
Received 31 May 2007; Accepted 12 December 2007

Recommended by S. Voloshynovskiy

Abstract

We discuss a robust image authentication scheme based on a hash string constructed from leading JPEG2000 packet data. Motivated by attacks against the approach, key-dependency is added by means of employing a parameterized lifting scheme in the wavelet decomposition stage. Attacks can be prevented effectively in this manner and the security of the scheme in terms of unicity distance is assumed to be high. Key-dependency however can lead to reduced sensitivity of the scheme. This effect has to be compensated by an increase of the hash length which in turn decreases robustness.