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Ahmed Y. Mahmoud

Work place: Department of Information Technology, Al-Azhar University-Gaza, Gaza, Palestine

E-mail: ahmed@alazhar.edu.ps

Website:

Research Interests: Discrete Mathematics, Information-Theoretic Security, Computational Geometry, Distributed Computing, Information Security, Computer systems and computational processes

Biography

Assoc. Prof. Dr. Ahmed Y. Mahmoud has received BSc. in Computer Science from Al-Zaytoonah University, Amman, Jordan in 1997, an MSc. in Applied Mathematics and Computer Science and PhD in Computer Engineering from Eastern Mediterranean University, North Cyprus, in 2001 and 2012, respectively. From 2001 to 2006 he was a Lecturer in the Computer Science Department at Al-Azhar University, Gaza Strip, Palestine. From September 2006 to September 2011, he was with the Computer Engineering Department at Eastern Mediterranean University, Famagusta, North Cyprus. Since January 2012 he has been an Assistant Professor in the Information Technology Department at Al-Azhar University, Gaza Strip, Palestine, and, since 2017, he has been an Associate Professor of the department of Information Technology Department, Al-Azhar University, Gaza Strip, Palestine. Assoc. Prof. Mahmoud has been assigned for several administration duties in addition to his academic activities: Since September 2022- present (Coordinator of Joint Postgraduate Programs at AUG), 2020 October – 2022 August. (Chairman of Information Technology Department), 2015 September – Present (Chairman of Postgraduate Studies Committee in the Faculty of Engineering and Information Technology), 2019 February – 2019 September (Vice Dean of Postgraduate Studies, AUG), 2015- 2019 February (Chairman of Information Technology Department), 2012 – October 2014 (Coordinator of Information Technology issues, AUG, 2012 – 2016 October (Chairman of laboratory and engineering workshops committee). On the other hand, Assoc. Prof. Mahmoud has been working as Chairman of Publicity and Media Committee in International Conference on Assistive and Rehabilitation Technologies (iCareTech 2020) August 28-29, 2020 and Chairman of Public Relations, Media, and IT Committee in ICPET 2019 October 23-24, 2019, International Conference on Promising Electronic Technologies. 
Assoc. Prof. Mahmoud was a member of different committees for example: Advisory Committee for Education and Training in the Union of the Palestinian Information Technology Association, Steering Committee of the project IBHATH- Qatar Charity, Advisory Committee for continuing education and community service, Al-Azhar University and Technical Committee of Smart Village for Palestinian society technologies. Assoc. Prof. Mahmoud has participated in different Erasmus + projects. His research interests are in the areas of information security, and management information systems. Assoc. Prof. Mahmoud has published several articles in international journals, book chapters, and conferences, for a list of publications you can have a look to Google scholar https://scholar.google.com/citations?hl=ar&user=WAAjVekAAAAJ

Author Articles
A Novel Model for Protecting the Privacy of Digital Images in Cloud Using Permutated Fragmentation and Encryption Algorithms

By Ahmed Y. Mahmoud Mohammed Ibraheem AL Kahlout

DOI: https://doi.org/10.5815/ijcnis.2024.05.04, Pub. Date: 8 Oct. 2024

Maintaining privacy is becoming increasingly challenging due to growing reliance on cloud services and software, respectively. Our data is stored in a virtual environment on unreliable cloud machines, making it susceptible to privacy breaches if not handled properly. Encrypting data before uploading it can be a solution to this problem, but it can be time-consuming. However, all of the encryption methods used to safeguard digital data so far did not fulfillment privacy and integration requirements. This is because encryption cannot function independently. Data that is encrypted and stored on a single cloud server can still be accessed by attackers, compromising the privacy of the data. In this paper, we propose a new model based on the user's classification of privacy level. The proposed model divides the digital file into multiple fragments and separately encrypts each fragment; each fragment is encrypted as separated blocks. Additionally, permutation is implemented on encrypted fragments because they are stored in the cloud with replication fragments on another cloud service. This approach ensures that even if the attacker’s gains access to one fragment, they would not be able to access the entire file, thereby safeguarding the privacy of the data.

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A Hill Cipher Modification Based on Eigenvalues Extension with Dynamic Key Size HCM-EXDKS

By Ahmed Y. Mahmoud Alexander G. Chefranov

DOI: https://doi.org/10.5815/ijcnis.2014.05.08, Pub. Date: 8 Apr. 2014

All the proposed Hill cipher modifications have been restricted to the use of dynamic keys only. In this paper, we propose an extension of Hill cipher modification based on eigenvalues HCM-EE, called HCM-EXDKS. The proposed extension generating dynamic encryption key matrix by exponentiation that is made efficiently with the help of eigenvalues, HCM-EXDKS introduces a new class of dynamic keys together with dynamically changing key size. Security of HCM-EXDKS is provided by the use of a large number of dynamic keys with variable size. The proposed extension is more effective in the encryption quality of RGB images than HCM-EE and Hill cipher-known modifications in the case of images with large single colour areas and slightly more effective otherwise. HCM-EXDKS almost has the same encryption time as HCM-EE, and HCM-HMAC. HCM-EXDKS is two times faster than HCM-H, having the best encryption quality among Hill cipher modifications compared versus HCM-EXDKS.

[...] Read more.
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