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Done By: Department of Computer Engineering
Post Date: 2024-07-24
Last Browse: 2024-09-08
It took place on Wednesday, 7/24/2024 Discussion of the master’s student (Saja Abdel Kazem Abdel Hassan) in the department council hall about her thesis tagged: HYBRID DIGITAL/OPTICAL ENCRYPTION OF MULTIPLE COLOR IMAGE USING MEMRISTIVE CHAOS AND COMPRESSIVE SENSING Hybrid encryption of multi-color images using two chaos-based techniques Memristors and piezo sensing The discussion committee consists of the gentlemen whose names are listed below: Prof. Sinan Hossam Mahdi / Ministry of Higher Education and Scientific Research / Department of Research and Development. President Prof. Israa Badr Nasser / Al-Nahrain University / College of Engineering. Organically M.D. Ethel Nofal Muhammad Taher / Al-Nahrain University / College of Engineering. Organically Prof. Dr. (Experienced Professor) Raad Sami Fayyad / Al-Nahrain University / College of Engineering. Member and supervisor With the fast
growth of multimedia technology and the Internet, the need to protect
information becomes increasingly critical. Image security has become more
important, and image encryption being a powerful and straightforward method. It
can be applied using digital, optical, or hybrid techniques. The main challenge
is to design a high-speed, highly secure hybrid encryption system for multiple
color image (MCI) that utilizes advanced techniques like high-order memristive
chaos and compressing techniques. This thesis addresses this challenge. An eighteenth-dimensional (18D) memristive chaotic generator
characterized by grid multi-double-scroll (GMDS) attractors is proposed. The
chaos has the highest chaos
dimension reported in the literature for image encryption purposes. The
generator produces an extremely rich and complex-dynamical behavior with three
positive Lyapunov exponents. The chaotic sequences are used to assist the
operation of proposed hybrid digital/optical encryption and decryption systems
for MCI. The encryption system consists of a digital encryption subsystem
(DEsS) cascaded with an optical encryption subsystem (OEsS) which are
controlled by six and twelve chaotic sequences, respectively. The DEsS is
implemented using four sequential stages (compressive sensing, scrambling, DNA
encoding, and diffusion). The OEsS works parallelly on the RGB components of
the digital encrypted image and implemented using double-chaotic phase encoding
in Fourier, fractional Fourier, and gyrator optical transforms domains,
respectively. All the used methods work interactively to increase the security
level and robustness of the proposed encryption system. The simulation
results show that the proposed encryption system works very satisfactory even
with a 64-image input (plain) template. The entropy factor reaches 7.9997 and 7.9998 for encrypted single and multiple color images,
respectively. The key space of the proposed system is 2 2551 which is
the highest among other image encryption systems reported in the literature. These results
prove the robustness and high security of the proposed encryption system.
The student has met the requirements for the certificate