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All Journal Jurnal Informatika dan Teknik Elektro Terapan METHOMIKA: Jurnal Manajemen Informatika & Komputerisasi Akuntansi METHODIKA: Jurnal Teknik Informatika dan Sistem Informasi JURNAL TEKNOLOGI DAN ILMU KOMPUTER PRIMA (JUTIKOMP) Jurnal Informatika Kaputama (JIK) Jurnal Pengabdian Masyarakat Borneo JTIK (Jurnal Teknik Informatika Kaputama) Journal of Artificial Intelligence and Digital Business Jurnal Pengabdian Pada Masyarakat METHABDI Majalah Ilmiah METHODA TAMIKA: Jurnal Tugas Akhir Manajemen Informatika & Komputerisasi Akuntansi
Jamaluddin
Universitas Methodist Indonesia
Religion Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Immunology & microbiology Languange, Linguistic, Communication & Media Medicine & Pharmacology Physics Public Health Social Sciences Other

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ANALISIS KINERJA ALGORITMA RSA PADA ENKRIPSI CITRA DIGITAL BERDASARKAN PARAMETER PSNR DAN MSE Jamaluddin; Manalu, Darwis Robinson; Hasugian, Paska Marto; Simamora, Roni Jhonson
METHODIKA: Jurnal Teknik Informatika dan Sistem Informasi Vol. 12 No. 1 (2026): Volume 12 Nomor 1 Tahun 2026
Publisher : Universitas Methodist Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46880/mtk.v12i1.5420

Abstract

Digital image security is an important issue in this era of increasingly massive multimedia-based data exchange, especially for sensitive information that requires a high level of protection. This study aims to analyze the performance of the Rivest Shamir Adleman (RSA) asymmetric cryptography algorithm in the digital image encryption process based on the Mean Squared Error (MSE) and Peak Signal-to-Noise Ratio (PSNR) parameters, as well as encryption and decryption times. The method used is a quantitative experiment on 30 digital images with varying resolutions (256×256, 512×512, and 1024×1024 pixels) and two RSA key lengths (1024-bit and 2048-bit). The test results show that the MSE value ranges from 0.001068 to 0.002620 and the PSNR value ranges from 75.08 to 78.34 dB, indicating that the decrypted images are of very high quality and close to the original images. However, the computation time increased significantly with increasing resolution and key length, with RSA 2048-bit taking almost twice as long as RSA 1024-bit. These findings show that the RSA algorithm is very effective in maintaining the integrity of digital images, but has limitations in terms of computational time efficiency, especially for high-resolution images. Therefore, a balance between security and performance is needed in practical implementation.
Dampak Digital Marketing, Kualitas Layanan, dan Inovasi Produk Terhadap Kepuasan Pelanggan Tokopedia Pada Mahasiswa Manajemen Angkatan 2024 Sinaga, Novtasya Olivia Br; Napitupulu, Junika; Jamaluddin, Jamaluddin
RIGGS: Journal of Artificial Intelligence and Digital Business Vol. 5 No. 1 (2026): Februari - April
Publisher : Prodi Bisnis Digital Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/riggs.v5i1.7996

Abstract

Penelitian ini bertujuan untuk menganalisis pengaruh digital marketing, kualitas layanan, dan inovasi produk terhadap kepuasan pelanggan pada platform e-commerce Tokopedia. Latar belakang penelitian ini didasarkan pada adanya kesenjangan antara harapan dan pengalaman pelanggan, khususnya pada kalangan mahasiswa sebagai pengguna aktif e-commerce. Metode penelitian yang digunakan adalah pendekatan kuantitatif dengan teknik pengumpulan data melalui kuesioner yang disebarkan kepada 124 mahasiswa Program Studi Manajemen Angkatan 2024 Universitas Methodist Indonesia. Analisis data yang dilakukan menggunakan regresi linier berganda untuk menguji pengaruh secara parsial dan simultan antar variabel. Hasil penelitian menunjukkan bahwa digital marketing berpengaruh negatif terhadap kepuasan pelanggan, yang mengindikasikan bahwa intensitas promosi yang berlebihan cenderung menurunkan kenyamanan pengguna. Sebaliknya, kualitas layanan dan inovasi produk berpengaruh positif dan signifikan terhadap kepuasan pelanggan. Inovasi produk menjadi variabel yang paling dominan dalam meningkatkan kepuasan pelanggan, menunjukkan pentingnya pengembangan fitur dan layanan yang relevan dengan kebutuhan pengguna. Secara simultan, ketiga variabel mampu menjelaskan sebesar 65,7% variasi kepuasan pelanggan. Penelitian ini menyimpulkan bahwa peningkatan inovasi produk dan kualitas layanan perlu menjadi prioritas utama, sementara untuk strategi digital marketing perlu dievaluasi kembali agar lebih efektif, tepat sasaran, dan tidak mengganggu pengalaman pengguna. Temuan ini diharapkan dapat memberikan kontribusi praktis bagi pengelola e-commerce dalam meningkatkan kepuasan pelanggan secara berkelanjutan
Perancangan Aplikasi Mobile untuk Rekomendasi Kuliner Lokal Efrans Michael Harahap; Jamaluddin Jamaluddin; Eva Julia Gunawati Harianja
METHOMIKA: Jurnal Manajemen Informatika & Komputerisasi Akuntansi Vol. 10 No. 1 (2026): METHOMIKA: Jurnal Manajemen Informatika & Komputersisasi Akuntansi
Publisher : Universitas Methodist Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46880/jmika.Vol10No1.pp161-167

Abstract

The rapid advancement of information technology has shifted the paradigm of tourism and culinary exploration towards mobile platforms. However, local culinary searches in Medan City are currently still conventional and random. Scattered culinary information across various social media without a comprehensive summary often confuses customers and complicates the promotion of micro-culinary businesses (UMKM) in the digital era. Existing commercial platforms often burden local sellers with high platform taxes. This research aims to design and implement an Android-Based Mobile Application for Local Culinary Recommendations as an effective solution to these problems. This application is built natively using the Java programming language for the Android client side, integrated with a PHP Application Programming Interface (API) and MySQL relational database. The system design involves a Client-Server architecture and includes three distinct access rights: User, Culinary Admin, and Super Admin. Implemented features include dining place search, interactive reviews, ratings, popularity levels based on view counts, and Google Maps API integration for precise culinary navigation routes. The result of this research is a self-managed mobile application that accelerates navigation access for users while assisting business owners in managing their stalls independently, objectively, and expanding their promotional reach without internal transaction fees.
Aplikasi Pendataan Jemaat pada GBKP Runggun Diski Berbasis Mobile Riandi Pratama Tarigan; Jamaluddin Jamaluddin; Rijois Iboy E. Saragih
TAMIKA: Jurnal Tugas Akhir Manajemen Informatika & Komputerisasi Akuntansi Vol 4 No 2(SEMNASTIK) (2024): TAMIKA: Jurnal Tugas Akhir Manajemen Informatika & Komputerisasi Akunt
Publisher : Universitas Methodist Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46880/tamika.Vol4No2(SEMNASTIK).pp14-17

Abstract

The Batak Karo Protestant Church (GBKP) Runggun Diski faces challenges in managing congregation data effectively and accurately. Since the data collection process is still done manually, there is a possibility of recording errors, data retrieval issues, and delays in disseminating information to the congregation. To address these problems, this research aims to design and develop a mobile-based congregation data management application. This application will enable church administrators to manage congregation data more efficiently and effectively. During the application development process, the Agile-based software development method allows for continuous iteration and improvement. The application is developed using technologies such as Android-based programming with the Kotlin programming language and Firebase for real-time data storage. The main features of this application include new congregation member registration, worship attendance recording, personal data management of congregation members, and notifications about church activities. The results of this application development indicate that the application runs well on mobile devices and meets the requirements of GBKP Runggun Diski for managing congregation data. It is expected that the use of this application will improve the efficiency of congregation data management, reduce recording errors, and facilitate administrators in delivering information to the congregation. Additionally, the application allows the congregation to access related information more easily than they had previously.
Perancangan Sistem Informasi Pengaduan Mahasiswa Universitas Methodist Indonesia Berbasis Web Rini Inriani Katarina Sitanggang; Jamaluddin Jamaluddin; Roni Jhonson Simamora
TAMIKA: Jurnal Tugas Akhir Manajemen Informatika & Komputerisasi Akuntansi Vol 4 No 2(SEMNASTIK) (2024): TAMIKA: Jurnal Tugas Akhir Manajemen Informatika & Komputerisasi Akunt
Publisher : Universitas Methodist Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46880/tamika.Vol4No2(SEMNASTIK).pp136-142

Abstract

Universitas Methodist Indonesia (UMI) faces various limitations in handling student complaints, which hinder the effectiveness of problem resolution. This research aims to build a web-based student complaint information system that can accommodate and manage student complaints quickly and efficiently. The observation method is used to observe the ongoing complaint process and interactions between students and the existing complaint system. Implementation of this system begins with the creation of a database designed to store and manage complaint data, user information and other important data. The system backend was developed using PHP to handle business logic, including complaint processing, user management, and interaction with the database. As a result, this system changes the complaint management process from previously manual to more efficient and computerized, so that students can easily submit complaints, monitor status, and view complaint history. This system also allows the campus to respond to complaints more quickly and effectively.
Perancangan Aplikasi Survey Kepuasan Pada Program Studi D-lll Manajemen Informartika dan Komputerisasi Akuntansi Universitas Methodist Indonesia Berbasis Web Eriska Hottriani Sinurat; Jamaluddin Jamaluddin; Eva Julia G. Harianja
TAMIKA: Jurnal Tugas Akhir Manajemen Informatika & Komputerisasi Akuntansi Vol 4 No 2(SEMNASTIK) (2024): TAMIKA: Jurnal Tugas Akhir Manajemen Informatika & Komputerisasi Akunt
Publisher : Universitas Methodist Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46880/tamika.Vol4No2(SEMNASTIK).pp184-190

Abstract

Currently, study program services to students are considered as one of the tools to achieve the competitive advantage of study programs. The purpose of this research is to design a web-based application that can measure student satisfaction in the D-III Management Informatics and Computerized Accounting Study Program at Methodist University of Indonesia. So far, the satisfaction survey has been carried out in a conventional way through Google Form and to recap the incoming data using Ms.Excel. The application design is carried out with a modeling language using UML and the programming used is PHP using the MySQL database. This application is designed to collect data on student satisfaction with academic services, learning processes, student services and facilities and infrastructure. The results of this survey will provide recommendations to the head of the study program on indices that need to be improved and support the study program accreditation process. 
Literature Review Implementasi Algoritma AES (Advanced Encryption Standard) 256-bit untuk Meningkatkan Keamanan Data pada Layanan Cloud Storage Ria Melani Tinambunan; Yosafat Mario Hutagaol; Parasman Pasaribu; Terry Henry Panggabean; Jamaluddin Jamaluddin
TAMIKA: Jurnal Tugas Akhir Manajemen Informatika & Komputerisasi Akuntansi Vol 6 No 1 (2026): TAMIKA: Jurnal Tugas Akhir Manajemen Informatika & Komputerisasi Akuntansi
Publisher : Universitas Methodist Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46880/tamika.Vol6No1.pp14-19

Abstract

The rapid development of cloud storage services within cloud computing technology offers significant convenience for storing and managing digital data. However, this development also raises serious data security challenges, including risks of data leakage, theft, and unauthorized access. One widely used solution to address these issues is the implementation of cryptographic techniques, particularly the Advanced Encryption Standard (AES) algorithm with a 256-bit key length. This study aims to analyze the implementation of the AES 256-bit algorithm in enhancing data security in cloud storage services through a literature review approach. The study reviews ten relevant national and international journal articles discussing the application of AES-256 in digital storage systems and cloud computing environments. The results indicate that the AES 256-bit algorithm is effective in maintaining data confidentiality and integrity during both storage and transmission. The 256-bit key length provides a high level of security and strong resistance to cryptanalytic attacks. However, several studies also identify challenges related to processing time efficiency and encryption key management. Therefore, it can be concluded that AES 256-bit is a reliable solution for improving data security in cloud storage services, provided that its implementation is adapted to system requirements and supported by effective key management.
Co-Authors Adela Bintang Asari Alex Leo Nardo Sipayung Alexander Simanullang Alfina, Ommi Ananda Pratama Angely Sinaga Apriani Magdalena Sibarani Arina P. Silalahi Aritonang, Mendarissan Arthur Simanjuntak Azelia Sarah Dwi Artha Br. Tarigan, Emia Edi Ulina Mahdalena Christiani Sinaga Darwis Robinson Manalu Dimita Hemalli Premasari Purba Doli Hasibuan Edison Sagala Efrans Michael Harahap Efrianses F. H. Sinaga El Rahmat Jaya Hulu Elda Rotio Harahap Elida Pane Elsya Secilia Margaretha Emma Rosinta Simarmata Endi Juli Anto Eriska Hottriani Sinurat Eva Julia G. Harianja Eva Julia Gunawati Harianja Eva Julia Gunawati Harianja Eva Julia Gunawati Harianja, Eva Julia Gunawati Eviyanti N. Purba Gea, Asaziduhu Gortap Lumbantoruan Harahap, Elda Rotio Harianja, Eva Julia G. Hasugian , Paska Marto Henri Yosua Pangihutan Hiras Sinaga Hutahean, Lisna Hutapea, Marlyna I. Ijonris, Yusuf Imelda S. Dumayanti Ira Mirantika Br. Ginting Jepryanta Natanael Brahmana Jonathan H. Saragih Jujur Marentha Nababan Junika Napitupulu Kartika Dewi Lian Adriawan Lidia Marisa Sianturi Lince R. Panataria Lisna Hutahean Lyna M. N. Hutapea M. Safii Manalu, Febrianisa Mutiara Marihot Gultom Marlyna I Hutapea Marpaung, Flora Melanthon Rumapea Melky Alessandro Purba Merry Anna Napitupulu, Merry Anna Moris Raichel Sitanggang Mufria J. Purba Muhammad Taufiq Rustam Mulatua Silalahi, Mulatua Naikson Fandier Saragih Nainggolan, Rena Nancy Lusiana Damanik Ndruru, Yufita Friska Nehemia Christian Boy Octania Togatorop Paiman Nababan Panjaitan, Calvin Nicolas Parangin-angin, Resianta Parasman Pasaribu Perangin-angin , Resianta Posma S. M. Lumbanraja Purba, Eviyanti N. Purba, Eviyanti Novita Reka Putri Halawa Rena Nainggolan Resianta Perangin-Angin Ria Melani Tinambunan Riandi Pratama Tarigan Rijois I. E Saragih Rijois I. E. Saragih Rijois Iboy E. Saragih Rimbun Siringoringo Rimbun Siringoringo Rimbun Siringoringo, Rimbun Rini Inriani Katarina Sitanggang Roni J. Simamora Sagala, Edison Saragih, Rijois Iboy E. Sembiring, Yasma Aprilyani Shara Asima Putri Sibarani Sianturi, Angel Maisya Sidabutar, Dewi Purnama Sihaloho, Senta Egrioni Simarmata, Ruth Elovani Sinaga, Novtasya Olivia Br Sinambela Marzuki Sion Sela Simorangkir Sitanggang, Rini Inriani Katarina Sitorus, Hegi Audria Sofya C. Sitompul Stevani L. Z. Simanjuntak Stevani Laura Zois Br. Simanjuntak Syahputri, Nita Tarigan, Riandi Pratama Terry Henry Panggabean Thomson J. Napitupulu Winda Silalahi Yosafat Mario Hutagaol Yosephine Sembiring Yosevina Tarigan Zalukhu, Delianus