Format-compliant jpeg2000 encryption with combined packet header and packet body protection

Authors:
Dominik Engel;Thomas Stütz;Andreas Uhl
Affiliations:
University of Salzburg, Salzburg, Austria;University of Salzburg, Salzburg, Austria;University of Salzburg, Salzburg, Austria
Venue:
Proceedings of the 9th workshop on Multimedia & security
Year:
2007

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Abstract

All proposals for format-compliant encryption schemes for JPEG2000 that have been made to date only encrypt packet body data, but leave packet header data in plaintext. In this paper we show that for providing strict confidentiality, leaving the packet header in plaintext severely compromises the security of these schemes, as discriminative - and for some settings even visual - information can be extracted from the header. We propose a set of format-compliant transformations of the packet header data that confines this information leakage. Furthermore, we discuss to what extent the proposed header protection scheme may be used to increase the performance of partial/selective encryption schemes that, rather than providing full confidentiality, trade off security for a decrease in computational demands.