Digital multimedia system security based on transform domain techniques

Caglayan, Okan
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The recent advances in multimedia systems have brought about extraordinary possibilities and opportunities. Even though these improvements provide the profound benefit of easily exchanged digital media through far-reaching networks, these technologies have also been exploited for criminal activity and malicious intent. In order to protect the systems integrity and to prevent the exploitation of digital media, techniques such as digital cryptography, steganography, and steganalysis have emerged in recent years.

A number of methods with promising results have been proposed in literature, however, these applications are either computationally intensive or do not provide the necessary security. The development of feasible and secure multimedia system techniques still exists as a problem of prime concern.

This dissertation presents the development of new multimedia system security based on transform domain methods. The followings were achieved: (1) Designed two frameworks in fast Fourier and Hartley transform representations. (2) Developed a multi-stage multimedia cryptosystem, which addressed the problems in full and selective encryption schemes simultaneously. (3) Introduced a combinational-discrete Fourier-Cosine transform features based image steganalysis. (4) Developed a loseless adaptive digital audio steganographic method. (5) Introduced an image steganographic method derived from Golden-Ratio Haar Wavelet transform.

A comprehensive analysis on these techniques was presented for comparisons based on the perceptual and statistical results.

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Cryptography, Multimedia, Steganalysis, Steganography
Electrical and Computer Engineering