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    Digital Image Encryption Using Elliptic Curve Cryptography: A Review
    (Institute of Electrical and Electronics Engineers Inc., 2022) Habek, Muhammed; Genc, Yasin; Aytas, Nilay; Akkoc, Ahmet; Afacan, Erkan; Yazgan, Erdem
    Today, digital images are used in many different applications. They can be social media applications or critical applications such as military and medical. However, cyber attacks or privacy problems also cause serious security problems for digital images. Therefore, various methods are proposed to ensure privacy and security. The first science that comes to mind is cryptography. It is a science of encryption. Encryption methods ensure the privacy of data. Many encryption methods are used to ensure the privacy and accuracy of the digital images. This paper reviews the encryption method based on elliptic curve cryptography for digital image encryption. This review describes the parameters and security attacks that affect the performance of digital image encryption. In addition, existing studies are reviewed. Thus, this paper is about the usefulness of both design criteria to be considered for new digital image encryption methods and comparing existing studies. © 2022 IEEE.
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    ELCPAS: A new efficient lightweight certificateless conditional privacy preserving authentication scheme for IoV
    (Elsevier, 2023) Genc, Yasin; Aytas, Nilay; Akkoc, Ahmet; Afacan, Erkan; Yazgan, Erdem
    This paper proposes a new efficient certificateless conditional privacy preserving authentication (CL-CPPA) scheme named ELCPAS, which is pairing-free, energy-efficient, lightweight which uses elliptic curve cryptography (ECC) for internet of vehicles (IoV). The ELCPAS is based on the certificateless signature scheme that eliminates the key escrow problem, which is the drawback of identity-based encryption. It performs batch message verification with a very efficient method which minimizes the delays in the message verification phase. In our proposed scheme, users (vehicle etc.) do not need to communicate with central units during each message signing. Thus, the computational load and connection problems in the central units are minimized. It is also quite fast as it does not use the bilinear pairing and map-to-point operations. The performance evaluation shows that ELCPAS has efficiency in scope of computation cost, communication cost and energy consumption cost compared to other existing schemes. The security evaluation is performed according to the random oracle model (ROM) and the proposed ELCPAS scheme has been shown to be secure. In addition, it provides security requirements and it is resistant to cyber-attacks. The results of the analyses performed according to the security criteria show that it is secure.(c) 2022 Elsevier Inc. All rights reserved.
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    Genetik Algoritma ile Genişbant Anten Tasarimi Wideband Array Design with Genetic Algorithm
    (Institute of Electrical and Electronics Engineers Inc., 2023) Dikdere, Mustafa Oner; Genc, Yasin; Korkmaz, Nilay Aytas; Akkoc, Ahmet; Afacan, Erkan; Yazgan, Erdem
    The importance of big data transfer and higher speed communication is increasing day by day in communication systems. Antennas are key objects in wireless communication systems. Antenna specifications can be designed according to wireless communication requirements. Genetic algorithms, one of the types of heuristic algorithms, play an important role in antenna design. In genetic algorithms, the proposed near-best design is given as a result to obtain the desired antenna properties. In this study, the microstrip linear antenna array was designed with the genetic algorithms, and reached a better specification than the frequency range determined by the National Communications Commission (FCC). © 2023 IEEE.
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    Higher Order Taylor and Golomb Costas Arrays
    (Institute of Electrical and Electronics Engineers Inc., 2023) Gudek, Mesut; Genc, Yasin; Korkmaz, Nilay Aytas; Akkoc, Ahmet; Afacan, Erkan; Yazgan, Erdem
    Costas arrays, which have been defined as special permutation matrices, have widespread applications in many fields. Low probability of intercept (LPI) radars are used to detect targets without being detected by hostile elements. Frequency Shift Keying is one of the modulation types used in LPI radars. Costas arrays are used to generate frequency sets for LPI radars. These frequency sets with frequency shift keying waveforms are mostly generated using methods based on finite field theory. In this study, a comprehensive search for higher order (up to 5000) variational Costas arrays have been performed with the software developed using C++ programming language. The results obtained are presented in tables. © 2023 IEEE.