Chaos-based Image/Signal Encryption

We present techniques for steganalysis of images that have been potentially subjected to steganographic algorithms, both within the passive warden and active warden frameworks. Our hypothesis is that steganographic schemes leave statistical evidence that can be exploited for detection with the aid of image quality fea…

Several fragile watermarking schemes presented in the literature are either vulnerable to vector quantization (VQ) counterfeiting attacks or sacrifice localization accuracy to improve security. Using a hierarchical structure, we propose a method that thwarts the VQ attack while sustaining the superior localization pro…

• AHMET MURAT TEKALP

We present a novel framework for lossless (invertible) authentication watermarking, which enables zero-distortion reconstruction of the un-watermarked images upon verification. As opposed to earlier lossless authentication methods that required reconstruction of the original image prior to validation, the new framewor…

• AHMET MURAT TEKALP

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• İHSAN PEHLİVAN
• ÜNAL ÇAVUŞOĞLU

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• AHMET ZENGİN
• İHSAN PEHLİVAN

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• AHMET ZENGİN
• SEZGİN KAÇAR

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In this paper, a novel true random bit generator (TRBG) based on a double-scroll attractor is proposed. The double-scroll attractor is obtained from a simple model which is qualitatively similar to Chua's circuit. In order to face the challenge of using the proposed TRBG in cryptography, the proposed TRBG is subjected…

• MÜŞTAK ERHAN YALÇIN

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• UĞUR ERKAN

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• ABDURRAHİM TOKTAŞ

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Discrete chaotic systems based on memristors exhibit excellent dynamical properties and are more straightforward to implement in hardware, making them highly suitable for generating cryptographic keystreams. However, most existing memristor-based chaotic systems rely on a single memristor. This paper introduces a nove…

• ABDURRAHİM TOKTAŞ
• UĞUR ERKAN