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

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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

Thu Jul 02 2026

Journal Name

Innovative Construction And Petrochemical Technologies

Improving Arabic Text Classification Accuracy Using Lightweight NLP Techniques

Arabic natural language processing

Arabic text classification

TF-IDF method

Chi-Square feature selection

linear SVM classifier

Logistic Regression

BiLSTM

AraBERT

efficient NLP models

accuracy and efficiency trade-off

Rasha

Safana

Sarah

Reiam

Rusul

Liqaa

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Arabic text classification is a challenging task because of the complex morphology of the language, the existence of different writing forms and a multitude of dialects, which can result in sparser common text representations. While transformer models such as AraBERT have obtained superior results on many Arabic NLP tasks, their high computational requirements make them difficult to deploy in environments with limited hardware resources. In some cases this can also make the model less practical for researchers working with basic computer systems. This study focuses on a more practical issue: how much accuracy a simple classifier may lose when the amount of required computation is reduced. We use a combined TF-IDF representation based on bo

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Publication Date

Fri Jan 01 2021

Journal Name

Journal Of Economics And Administrative Sciences

Predicting Social Security Fund compensation in Iraq using ARMAX Model

/ Akaike Standard (AIC) –Prediction Error Standard(FPE) - Bayesian Akaike Standard (BIC) - Ordinnary least square Method (OLS) - recursive least square Method( RLS) - Kalman Filter – Forgetting factor - Prediction

Zaid Khalil

Firas Ahmmed

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Time series have gained great importance and have been applied in a manner in the economic, financial, health and social fields and used in the analysis through studying the changes and forecasting the future of the phenomenon. One of the most important models of the black box is the "ARMAX" model, which is a mixed model consisting of self-regression with moving averages with external inputs. It consists of several stages, namely determining the rank of the model and the process of estimating the parameters of the model and then the prediction process to know the amount of compensation granted to workers in the future in order to fulfil the future obligations of the Fund. , And using the regular least squares method and the frequ

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Publication Date

Wed Mar 10 2021

Journal Name

Baghdad Science Journal

Some Types of Mappings in Bitopological Spaces

Keywords. Filter base

nm- j-ω-converges

nm- j-ω-directed toward a set

nm- j-ω- closed mappings

j-ω- continuous mappings

j-ω-rigid a set

nm- j-ω-perfect mappings.

G. S.

Yousif

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This work, introduces some concepts in bitopological spaces, which are nm-j-ω-converges to a subset, nm-j-ω-directed toward a set, nm-j-ω-closed mappings, nm-j-ω-rigid set, and nm-j-ω-continuous mappings. The mainline idea in this paper is nm-j-ω-perfect mappings in bitopological spaces such that n = 1,2 and m =1,2 n ≠ m. Characterizations concerning these concepts and several theorems are studied, where j = q , δ, a , pre, b, b.

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(9)

Publication Date

Wed Dec 01 2021

Journal Name

Structures

The effect of ground motion characteristics on the fragility analysis of reinforced concrete frame buildings in Australia

The seismic performance of buildings can be assessed through fragility analysis as it yields the probability of the demand exceeding the capacity at a specified level of intensity. Although it's well-identified that earthquake uncertainties dominate the fragility characteristics

the influence of the characteristics of the earthquake on the fragility analysis is not well investigated. This study aims to compare the effect of earthquake characteristics on the fragility values of typical buildings in Australia. To achieve this

a typical reinforced concrete building is selected and modeled using a finite element approach. Various ground motion suites

such as near-fault

far-fault

and long-duration are selected

and the fragility analysis has been carried out for each ground motion suite. It is observed that the variation in the median values of the collapse fragilities can be as high as 48% between short-duration and long-duration ground motions

and about 40% between long-duration and pulse-like ground motions.

Aya

Sujith

Javad

Alaa

M.D. Morshed

Abbas A.

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