Yazar "Sahin, Engin" seçeneğine göre listele

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    A novel quantum steganography algorithm based on LSBq for multi-wavelength quantum images
    (Springer, 2018) Sahin, Engin; Yilmaz, Ihsan
    In this study, a novel quantum steganography algorithm based on LSBq for multi-wavelength quantum images is proposed. In this study, both the text and the binary image messages are embedded into the cover image. The results of simulations and analysis show that our algorithm satisfies the requirements of steganography algorithms. Also, we used modulo method and Hilbert scrambling method for the security of the hidden message. It is seen that an unauthorized person obtains meaningless information when attempting to extract a embedded information through known methods. The results show that the algorithm is robust against attack when several attacks are applied on the stego-image. Finally, we compare our proposed algorithm with the related works. The results of simulation show that the our proposed algorithm has many advantages according to the related algorithms.
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    Öğe
    QRMA: quantum representation of multichannel audio
    (Springer, 2019) Sahin, Engin; Yilmaz, Ihsan
    In this study, quantum representation of multichannel adio (QRMA) that can be used in many fields in future is proposed. The QRMA uses three entangled qubit sequences where time, channel, negative and positive amplitude values can be stored. The three-qubit sequences are in basis state: |0 and |1. The preparation of the QRMA starting from the initial state |0 is presented. In addition, multichannel audio is obtained from the QRMA quantum state. Several operations such as signal merging, signal addition, signal inversion, signal reversal, channel merging and channel reversal are studied on the QRMA. The simulations and the analyses show that the QRMA has more advantages than the other models in the literature.
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    QRMW: quantum representation of multi wavelength images
    (Tubitak Scientific & Technological Research Council Turkey, 2018) Sahin, Engin; Yilmaz, Ihsan
    In this study, we propose quantum representation of multiwavelength images (QRMW) that gives preparation and retrieving procedures of quantum images. The proposed QRMW model represents multichannel and 2(n) x 2(m) images. Moreover, we present image comparison and some image operations based on the QRMW model. Comparing our model with the models in the literature, the QRMW model has less time complexity. It also uses fewer qubits than existing models in the literature.
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    Öğe
    Quantum arithmetic operations based on quantum fourier transform on signed integers
    (World Scientific Publ Co Pte Ltd, 2020) Sahin, Engin
    The quantum Fourier transform (QFT) brings efficiency in many respects, especially usage of resource, for most operations on quantum computers. In this study, the existing QFT-based and non-QFT-based quantum arithmetic operations are examined. The capabilities of QFT-based addition and multiplication are improved with some modifications. The proposed operations are compared with the nearest quantum arithmetic operations. Furthermore, novel QFT-based subtraction, division and exponentiation operations are presented. The proposed arithmetic operations can perform nonmodular operations on all signed numbers without any limitation by using less resources. In addition, novel quantum circuits of two's complement, absolute value and comparison operations are also presented by using the proposed QFT-based addition and subtraction operations.