JPEG Encryption

Author Alexander Bliem [email protected]

Author Stefan Auer [email protected]

Date 01.07.2013

Version 1.0

Brief: This is a minimal decoder for baseline JPEG images and includes a JPEG en- and decryption algorithm, based on an AES OFB-Mode pseudo random number generator. It accepts memory dumps of JPEG files as input and generates a memory dump of the encrypted JPEG image. All YCbCr subsampling schemes with power-of-two ratios are supported, as well as restart intervals. Progressive or lossless JPEG is not supported. For further details to the bit-stream-based encryption algorithm, as well as to run-time performance measurements see the following journal article: Stefan Auer, Alexander Bliem, Dominik Engel, Andreas Uhl, Andreas Unterweger, "Bitstream-based JPEG Encryption in Real-time". In Chang-Tsun Li (Ed.) International Journal of Digital Crime and Forensics, vol. 5(3), accepted.

The JPEG decoder is based on the nanoJPEG open source project containing the following license:

NanoJPEG -- KeyJ's Tiny Baseline JPEG Decoder version 1.3 (2012-03-05) by Martin J. Fiedler [email protected]

This software is published under the terms of KeyJ's Research License, version 0.2. Usage of this software is subject to the following conditions: 0. There's no warranty whatsoever. The author(s) of this software can not be held liable for any damages that occur when using this software.

1. This software may be used freely for both non-commercial and commercial purposes.
2. This software may be redistributed freely as long as no fees are charged for the distribution and this license information is included.
3. This software may be modified freely except for this license information, which must not be changed in any way.
4. If anything other than configuration, indentation or comments have been altered in the code, the original author(s) must receive a copy of the modified code.