SHA-512 Based Key Generation and Two-Dimensional Logistic Permutation with a Median Filter for Enhanced Grayscale Image Encryption

Ibtisam A Taqi

doi:10.32604/cmc.2026.082352

Details

Publication Date

Fri Aug 14 2026

Journal Name

Computers, Materials & Continua

Volume

89

Issue Number

2

DOI

10.32604/cmc.2026.082352

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SHA-512 Based Key Generation and Two-Dimensional Logistic Permutation with a Median Filter for Enhanced Grayscale Image Encryption

Gray image

SHA-512

chaos

2D logistic map

median filter

Ibtisam A Taqi

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Publication Date

Wed Oct 04 2023

Journal Name

Exergy - New Technologies And Applications

High Synthetic Image Coding System

image coding

image compression

Discrete Cosine Transform (DCT)

Discrete Wavelet Transform (DWT)

entropy coding

quantization

Abdallah

Loay

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Compressing an image and reconstructing it without degrading its original quality is one of the challenges that still exist now a day. A coding system that considers both quality and compression rate is implemented in this work. The implemented system applies a high synthetic entropy coding schema to store the compressed image at the smallest size as possible without affecting its original quality. This coding schema is applied with two transform-based techniques, one with Discrete Cosine Transform and the other with Discrete Wavelet Transform. The implemented system was tested with different standard color images and the obtained results with different evaluation metrics have been shown. A comparison was made with some previous rel

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Publication Date

Fri Oct 16 2026

Journal Name

Journal Mustansiriyah Of Sports Science

The effect of using Daniel's model for people with two types of brain control (left and right) to learn the skill of the Cartwheel in artistic gymnastics for second-stage students

Daniel's model

two patterns of brain control

the Cartwheel.

Ayad

Murtada,

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The research problem focused through the researcher's experience in the gymnastics game and the lack of use of educational models that give the student an important role in the educational process, so it became necessary to identify the type of prevailing style for students, and the need for diversity in the use of educational models based on scientific theories, including the Daniel Document model. Based on three theories of learning, which are structural, behavioral, and meaningful learning. The research aimed to identify the effect of using the Daniel model for people with two types of brain control (left and right) to learn the skill of the Cartwheel in artistic gymnastics for students of the second stage. The researcher used the experi

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Publication Date

Tue Sep 01 2020

Journal Name

Optical Fiber Technology

A novel modified fiber Bragg grating (FBG) based ammonia sensor coated with polyaniline/graphite nanofibers nanocomposites

H.A.

M.H.

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(19)

(18)

Publication Date

Mon Jan 01 2024

Journal Name

Anais Da Academia Brasileira De Ciências

Morphological study for Accipitrid birds (Accipitridforms, Accipitridae) in Iraq; part two

A part two of Accipitridae Family members that belong to three genera: Circus

Gyps

and Neophron were documented as morphometrics

distribution ranges

and conservation status were reviewed and comprehensively discussed. A total of 29 voucher specimens belong to six species which are conserved in the “Iraq Natural History Research Center and Museum INHM” as follow: Marsh Harrier Circus aeruginosus (Linnaeus

1758)

Hen Harrier Circus cyaneus (Linnaeus

1766)

Montagus Harrier Circus pygargus (Linnaeus

1758)

Pallid Harrier Circus macrourus (Gmelin

1770)

Egyptian vulture Neophron percnopterus (Linnaeus

1758)

and Griffon vulture Gyps fulfus (Hablitz

1783). The results revealed significant criteria about near threatened NT species IUCN and Birdlife International listed as Pallid Harrier Circus macrourus

and Endangered (EN) species as Egyptian vulture Neophron percnopterus globally decreasing population trend.

HIND D.

KHALIDA I.

AFKAR M.

SUHAD Y.

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Publication Date

Fri Nov 15 2019

Journal Name

Journal Of Materials And Applications

Load Transfer Stiffness of Two-layer Roller Compacted Concrete for Pavements

Haneen

Nick

Andrew

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Roller compacted concrete (RCC) is a form of plain concrete pavement (JPCP). RCC is a zero-slump concrete consisting of well-graded aggregate, cement and water. RCC has many advantages over other pavement types, particularly cost and speed of construction. Recently, RCC has undergone many developments mostly directed towards improving quality, including smoothness and durability. RCC now has the potential to combine the performance of concrete with the low cost of asphalt installation. A two-layer system of RCC with different aggregate types and sizes was utilized in this study. This paper presents the determination of load transfer stiffness across induced joints in a two-layer RCC system based on a cyclic shear test. The test was

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(7)

Publication Date

Mon Feb 01 2021

Journal Name

Iop Conference Series: Materials Science And Engineering

Free-form geometries in contemporary architecture – dimensional rules of Folded, Blob and Formlessness architecture

Anas Hameed

Huda

Nazar K.

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Abstract<p>The style of Free-form Geometry (FFG) has emerged in contemporary architecture within the last three decades around the world through the progress of digital design tools and the development of constructive materials. FFG is considered as the hard efforts of several contemporary architects to release their products from familiar restrictions to discover new and unfamiliar styles under the perspective of innovation. Many contemporary architects seek to recognize their forms and facilitate dealing with according to specific dimensional rules. The main research problem is the lack of knowledge, in the field of architecture, in previous literature about the formation processes in achievin</p> ... Show More

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Publication Date

Fri Dec 30 2011

Journal Name

Mustansiria Dental Journal

Effect of microwave irradiation on disinfection, dimensional accuracy, and surface porosity of dental casts

Shorouq M.

Maha A.

Bayan S.

...Show More Authors

To evaluate the effectiveness of different microwave irradiation exposure times on the disinfection of dental stone samples immersed in different solutions, and its affect on the dimensional accuracy and surface porosity. Dental stone casts were inoculated with an isolate of Bacillus subtilis to examine the efficiency of microwave irradiation as a disinfection method while immersed in different solutions; water, 40% sodium chloride, or without immersion for different durations. Dimensional accuracy and surface porosity were also evaluated. Significant reduction in colony counts of Bacillus subtilis were observed after 5 minutes of microwave irradiation of immersed dental casts in water and NaCl solution. No evidence of growth was observed a

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(4)

Publication Date

Sun Mar 01 2026

Journal Name

Journal Of Engineering

Bi-objective Machine Scheduling Using Enhanced Simulated Annealing and Bee Algorithm Approaches

Bee algorithm

Evolutionary optimization

Pareto front

Scheduling

Simulated annealing.

Iraq

...Show More Authors

Many industrial systems involve multiple criteria and objectives, and they are very complex problems in computational science, such as task scheduling. We propose bi-criteria and bi-objective scheduling problems, which are solved by two nature-inspired evolutionary algorithms, such as Simulated Annealing (SA) and Bee Algorithm (BA). This problem is characterized by scheduling a batch of tasks on multiple machines, and it is fundamental because the solution should focus on the simultaneous optimization of two conflicting objectives: the makespan minimization and the total tardiness minimization. This problem is NP-Hard, and therefore, two evolutionary methods were used to search for solutions intelligently in this huge, very complex

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Publication Date

Wed Jan 01 2020

Journal Name

Advanced Composites Letters

Enhanced thermal and electrical properties of epoxy/carbon fiber–silicon carbide composites

Aseel A.

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The silicon carbide/carbon fiber (SiC/CF) hybrid fillers were introduced to improve the electrical and thermal conductivities of the epoxy resin composites. Results of Fourier transform infrared spectroscopy revealed that the peaks at 3532 and 2850 cm⁻¹ relate to carboxylic acid O–H stretching and aldehyde C–H stretching appearing deeper with an increased volume fraction of SiC. Scanning electron microscopic image shows a better interface bonding between the fiber and the matrix when the volume fraction of SiC particles are increased. As frequency increases from 10² Hz to 10⁶ Hz, dielectric constants decrease slightly. Dissipation factor (tan δ) values keep low a

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(33)

(41)

Publication Date

Wed Jan 25 2023

Journal Name

Molecular Simulation

Engineering promising A-π-D type molecules for efficient organic-based material solar cells

Solar cells

optoelectronic

π-linkers

red shift

energy gap

Musaddak Maher

Taleeb Zedan

Mustafa M.

Sallal A. H.

Haider

Ahmed Mahdi

Safa K.

Abdol Ghaffar

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Within this work, to promote the efficiency of organic-based solar cells, a series of novel A-π-D type small molecules were scrutinised. The acceptors which we designed had a moiety of N, N-dimethylaniline as the donor and catechol moiety as the acceptor linked through various conjugated π-linkers. We performed DFT (B3LYP) as well as TD-DFT (CAM-B3LYP) computations using 6-31G (d,p) for scrutinising the impact of various π-linkers upon optoelectronic characteristics, stability, and rate of charge transport. In comparison with the reference molecule, various π-linkers led to a smaller HOMO–LUMO energy gap. Compared to the reference molecule, there was a considerable red shift in the molecules under study (A1–A4). Therefore, based on

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