Copyright © 2007 Elsevier Inc. All rights reserved.
A steganographic method based upon JPEG and particle swarm optimization algorithm
Received 5 January 2006;
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Abstract
In this paper, a novel steganographic method, based on JPEG and Particle Swarm Optimization algorithm (PSO), is proposed. In order to improve the quality of stego-images, an optimal substitution matrix for transforming the secret messages is first derived by means of the PSO algorithm. The standard JPEG quantization table is also modified to contain more secret messages. The transformed messages are then hidden in the DC-to-middle frequency components of the quantized DCT coefficients of the cover-image. Finally, a JPEG file with secret messages is generated through JPEG entropy coding. We compare our algorithm with Chang et al.’s JPEG-based steganographic algorithm. The experimental results show that our proposed method has larger message capacity and better image quality than Chang et al.’s. In addition, our method also has a high security level.
Keywords: JPEG; Steganography; Information hiding; Particle swarm optimization (PSO) algorithm; Jpeg-Jsteg
Article Outline
- 1. Introduction
- 2. Related works
- 3. The proposed method
- 3.1. The embedding procedure
- 3.2. The extracting procedure
- 3.3. General principle of particle swarm optimization algorithm
- 3.4. Searching for substitution matrix through PSO algorithm
- 4. Experimental results and discussions
- 5. Conclusions
- Acknowledgements
- References







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