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All Journal Journal of Information Systems and Technology Research Jurnal Nasional Teknologi Komputer
M Syaifuddin
Universitas Budi Darma
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering

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Design and Security Evaluation of an AES-256–Based Encrypted Receipt System for Electronic Service Businesses M Syaifuddin; Moch. Iswan Perangin-angin
Journal of Information Systems and Technology Research Vol. 5 No. 2 (2026): May 2026
Publisher : Ali Institute or Research and Publication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55537/jistr.v5i2.1397

Abstract

The proliferation of digital technology has substantially heightened threats to customer data security within electronic service businesses at PT. Veneta. At present, PT. Veneta relies upon a manual transaction-recording system that remains vulnerable to theft, loss, and data deterioration. The absence of a computerized data-security infrastructure engenders significant vulnerabilities for potential misuse of customer data by unauthorized entities. In an effort to resolve these substantial challenges, a robust, efficient, and well-architected data-security system is requisite. The AES-256 algorithm represents one of the most formidable cryptographic algorithms for data protection, characterized by lightweight computational complexity. This algorithm demonstrates exceptional resistance to brute-force attacks and frequency-analysis methodologies. This research endeavors to design and implement a web-based customer data-security system utilizing the AES-256 algorithm at PT. Veneta. The research methodology employs Research and Development (R&D) utilizing a Waterfall approach encompassing six phases: requirements analysis, system design, development, testing, deployment, and implementation. The research findings demonstrate that the AES-256 algorithm successfully encrypts customer data into a 64-character hexadecimal ciphertext with exceptionally robust security characteristics. Unauthorized attempts to compromise the ciphertext via brute-force methodologies would necessitate 3.31 × 1056 years and 2256 key combinations. The data-security system implemented at PT. Veneta not only furnishes robust customer data protection but also substantially enhances customer confidence in data disclosure.
Penentuan Penerima Beasiswa KIP Kuliah Menggunakan ROC dan SAW M Syaifuddin
Jurnal Nasional Teknologi Komputer Vol 3 No 4 (2023): Volume 3 Nomor 4 Oktober 2023
Publisher : CV. Hawari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61306/jnastek.v3i4.510

Abstract

The selection of KIP Kuliah scholarship recipients involves multiple criteria and a limited quota, so a structured decision model is required to reduce inconsistent manual assessment. This study applies Rank Order Centroid (ROC) to derive criterion weights and Simple Additive Weighting (SAW) to rank applicants. Seven applicant records from Universitas Budi Darma were used as a calculation sample. Five benefit criteria were assessed: competency relevance, foreign-language proficiency, social-card ownership, general-knowledge examination score, and interview score. ROC produced weights of 0.4567, 0.2567, 0.1567, 0.0900, and 0.0400, respectively. SAW normalization used the benefit formula xij/max(xij), ensuring normalized values in the interval 0–1. The recalculated preference scores ranged from 0.996386 to 0.998261. Alternative A5, Citra Lisensya Manurung, obtained the highest preference value of 0.998261, followed by A2 and A7. A ±10% one-at-a-time weight sensitivity check retained A5 as the top-ranked alternative in all scenarios. The ROC–SAW combination therefore provides a transparent ranking mechanism; however, the sample also shows that three high-weight criteria are identical across all candidates, limiting their discriminatory contribution.
Co-Authors Moch. Iswan Perangin-angin