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Comparative Study of Different Cryptographic Algorithms

Journal of Information Security 2020年第3期11卷 138-148页

作者： baha eldin hamouda hassan hamouda Department of Information Technology Gulf Colleges Hafar Al-Batin KSA

With the increasing interconnection of computer networks and sophistication of cyber-attacks, Cryptography is one way to make sure that confidentiality, authentication, integrity, availability, and identification of data user can be maintained as well as security and privacy of data provided to the user. Symmetric key cryptography is a part of the cryptographic technique which ensures high security and confidentiality of data transmitted through the communication channel using a common key for both encryption and decryption. In this paper I have analyzed comparative encryption algorithms in performance, three most useful algorithms: Data Encryption Standard (DES), Triple DES (3DES) also known as Triple Data Encryption Algorithm (TDEA), and Advanced Encryption Standard (AES). They have been analyzed on their ability to secure data, time taken to encrypt data and throughput the algorithm requires. The performance of different algorithms differs according to the inputs.

关键词： Cryptography DES 3DES AES Encryption Decryption Ciphertext Plaintext

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基于分散型和扩散型随机序对几种寿命分布类的刻画(英文)

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应用概率统计 2004年第1期20卷 66-76页

作者：胡太忠贺方毅 baha-eldin Khaledi 中国科学技术大学统计与金融系合肥230026 伊朗Razi大学统计系

本文基于分散型和(或)扩散型随机序,利用随机变量的剩余寿命给出了寿命分布类ILR,IFR,DMRL和IFR(2)及其对偶类的刻画.作为主要结果的一个应用,用k/n-系统的剩余寿命对IFR和DMRLS及其对偶类进行了刻画.这些结果拓宽和加强了文献中已有的... 详细信息

本文基于分散型和(或)扩散型随机序,利用随机变量的剩余寿命给出了寿命分布类ILR,IFR,DMRL和IFR(2)及其对偶类的刻画.作为主要结果的一个应用,用k/n-系统的剩余寿命对IFR和DMRLS及其对偶类进行了刻画.这些结果拓宽和加强了文献中已有的结果.

关键词：一般随机序失效率序似然率序平均剩余寿命序单增凹(凸)序右伸展序寿命分布类

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Pure SnO2Gas Sensor with High Sensitivity and Selectivity towards C2H5OH

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Advances in Nanoparticles 2021年第2期10卷 66-74页

作者： Abeer Alhadi Shuyi Ma Tingting Yang Shitu Pei Pengdou Yun Khalid Ahmed Abbakar Qianqian Zhang Nina Ma Manahil H. Balal hamouda Adam hamouda Khalid Mohammed Adam Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province College of Physics and Electronic Engi-neering Northwest Normal University Lanzhou China College of Mathematics and Statistics Northwest Normal University Lanzhou China Department of Mathematics and Physics Faculty of Education University of Gadarif Gadarif Sudan Physics Department Faculty of Science and Art Al Baha University Gilwah Saudi Arabia College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou China Department of Chemistry Faculty of Science University of Kordofan El Obeid Sudan

To observation, poisonous gases in the environment, Sensors with high selectivity, high response and low operating temperature are required. In this work, pure SnO2 nanoparticles was prepared by using a simple and inexpensive technique (hydrothermal method) without a template. Various confirmatory tests were performed to characterize SnO2 nanoparticles such as energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Transition Electron Microscopy (TEM), during the detection of the gas, we found that pure SnO2 nanoparticles has a high selectivity for ethanol to 100 ppm at a low temperature (180°C) and a high response (about 27 s) and a low detection limit of 5 ppm, also it have response/recovery ti

关键词： Hydrothermal Method Nanoparticles Ethanol SnO2 Gas Sensor

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Synthesis and Characterization of SnO2Flower-Shaped by Hydrothermal Route for Formaldehyde Sensing Properties

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Advances in Materials Physics and Chemistry 2021年第4期11卷 67-77页

作者： Abeer Alhadi Shuyi Ma Shitu Pei Tingting Yang Pengdou Yun Qianqian Zhang hamouda Adam hamouda Li Wang Omer Almamoun Altayeb Alshiply Pengfei Cao Manahil H. Balal Khalid Ahmed Abbakar Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province College of Physics and Electronic Engineering Northwest Normal University Lanzhou China College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou China Department of Chemistry Faculty of Science University of Kordofan El Obeid Sudan Faculty of Petroleum and Hydrology Engineering West Kordofan Peace University Almugled Sudan Department of Physics Faculty of Education University of Khartoum Khartoum Sudan Physics Department Faculty of Science and Art Al Baha University Gilwah KSA Department of Mathematics and Physics Faculty of Education University of Gadarif Gadarif Sudan College of Mathematics and Statistics Northwest Normal University Lanzhou China

In this work, we’ve made SnO2 flower formed with the aid of using easy test steps, and without cost, which is the hydrothermal approach and without a template. We have used a variety of techniques to characterize SnO2 flower-shaped by (SEM, TEM, XRD, BET and XPS) instruments. Confirmatory tests carried out have proven that the surface of the tetragonal structure of SnO2 has a rough surface which makes it excellent for its gas-sensing properties. The gas detection test of SnO2 flower-shaped proved that it possesses the selectivity of formaldehyde gas (about 30), the optimum operating temperature of the sensor is 220°C, and also the sensor has a high response time and recovery time is (5 s and 22 s) to 100 ppm, respectively. Particularly, the sensor has an obvious response value (2) when exposed to 5 ppm formaldehyde. As well, the mechanism of gas-sensing was also discussed.

关键词： SnO2 Flower-Shaped Hydrothermal Method Formaldehyde Semiconductor Gas Sensor

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