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Authentication and Secret Message Transmission Technique Using Discrete Fourier Transformation

Author(s): Debnath BHATTACHARYYA | Jhuma DUTTA | Poulami DAS | Samir Kumar BANDYOPADHYAY | Tai-hoon KIM

Journal: International Journal of Communications, Network and System Sciences
ISSN 1913-3715

Volume: 02;
Issue: 05;
Start page: 363;
Date: 2009;
Original page

Keywords: Data Hiding | Authentication | Frequency Domain | Discrete Fourier Transformation (DFT) | Inverse Discrete Fourier Transform (IDFT) | S-Tools

In this paper a novel technique, Authentication and Secret Message Transmission using Discrete Fourier Transformation (ASMTDFT) has been proposed to authenticate an image and also some secret message or image can be transmitted over the network. Instead of direct embedding a message or image within the source image, choosing a window of size 2 x 2 of the source image in sliding window manner and then con-vert it from spatial domain to frequency domain using Discrete Fourier Transform (DFT). The bits of the authenticating message or image are then embedded at LSB within the real part of the transformed image. Inverse DFT is performed for the transformation from frequency domain to spatial domain as final step of encoding. Decoding is done through the reverse procedure. The experimental results have been discussed and compared with the existing steganography algorithm S-Tools. Histogram analysis and Chi-Square test of source image with embedded image shows the better results in comparison with the S-Tools.
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