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All Journal Jurnal Masyarakat Informatika JOURNAL OF APPLIED INFORMATICS AND COMPUTING Journal of Computing Theories and Applications
Imanuel Harkespan
Universitas Dian Nuswantoro
Computer Science & IT Decision Sciences, Operations Research & Management

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Kriptostegano Menggunakan Data Encryption Standard dan Least Significant Bit dalam Pengamanan Pesan Gambar Ifan Rizqa; Aprilyani Nur Safitri; Imanuel Harkespan
Jurnal Masyarakat Informatika Vol 13, No 2 (2022): November 2022
Publisher : Department of Informatics, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jmasif.13.2.44547

Abstract

Aplikasi yang menerapkan metode LSB dan algoritma kriptografi DES ini berjalan dengan baik dan mampu menyisipkan dan mengekstrakan pesan dan dapat mengenkripsi dan deskripsi isi pesan. Pada penelitian Penyisipan Pesan Ke Dalama Gambar Dengan Menggunakan Metode Least Significant Bit (LSB) dan enkripsi dengan menggunakan Algoritma Data Encryption Standard (DES) yang mempunyai tujuan untuk menambah keamanan pesan agar seseorang yang tidak bertanggung jawab tidak dapat mengetahui sebuah pesan rahasia yang akan dikirim. Aplikasi ini hanya mengamankan sebuah pesan kedalam sebuah citra dan merubah isi pesan dari yang dikethaui maknanya ke yang tidak diketahui maknanya. Pada penelitian ini telah diterapkan metode LSB-DES pada gambar 281x320 pixel dengan cover berupa gambar berwarna dan pesan berupa kata. PSNR yang dihasilkan adalah 86.64 db untuk pesan kata “rahasia. Berdasarkan penelitian dapat disimpulkan hasil PSNR nilainya tinggi, maka kualitas citra bagus, maka dari itu hasil gambar steganogragi pun sangat baik.
Understanding Statistical and Temporal Representations for Large-Scale IoT DDoS Detection Through Ablation-Driven Analysis Daniel Nomolas Wicaksono; De Rosal Ignatius Moses Setiadi; Ajib Susanto; Imanuel Harkespan; Mohamad Afendee Mohamed; Aceng Sambas
Journal of Computing Theories and Applications Vol. 3 No. 4 (2026): JCTA 3(4) 2026
Publisher : Universitas Dian Nuswantoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62411/jcta.16126

Abstract

Recent Internet of Things (IoT) intrusion detection studies have reported near-perfect benchmark performance for Distributed Denial of Service (DDoS) detection, yet limited attention has been given to understanding how different traffic representations contribute to the detection process under highly imbalanced traffic conditions. This study presents an ablation-driven analysis to investigate the contribution of statistical and temporal representations for large-scale IoT DDoS detection using the CICIoT2023 dataset. Three experimental scenarios are evaluated, including statistical representation, temporal sequence representation, and hybrid statistical–temporal representation. Temporal representations are learned using a one-dimensional Convolutional Neural Network (1D-CNN) with lag-based traffic sequences, while ensemble tree-based classifiers are employed for final classification and representation analysis. In addition, multiple ablation configurations are designed to evaluate the impact of temporal dependency modeling and feature engineering strategies on detection performance. Experimental results show that statistical traffic representations remain highly effective for DDoS detection on CICIoT2023, achieving 99.36% accuracy and 99.31% weighted F1-score in the statistical representation scenario. Feature importance analysis further indicates that engineered statistical features contribute substantially more to the classification process than CNN-based temporal representations. Although temporal modeling captures sequential traffic behavior, its contribution is relatively limited and mainly acts as a complementary representation. Furthermore, the hybrid configuration produces only marginal improvements over the statistical representation alone. These findings highlight the importance of representation-level analysis for understanding the actual contribution of statistical and temporal modeling in modern IoT intrusion detection systems beyond relying solely on benchmark accuracy.
Three-Tier Disaster Logistics System Integrating GIS and MILP Optimization Danny Oka Ratmana; Muhammad Syaifur Rohman; Galuh Wilujeng Saraswati; Filmada Ocky Saputra; Aprilyani Nur Safitri; Imanuel Harkespan
Journal of Applied Informatics and Computing Vol. 10 No. 3 (2026): June 2026
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jaic.v10i3.12727

Abstract

Effective disaster logistics management requires rapid, data-driven decision support that bridges optimization theory and operational practice. Existing systems either rely on theoretical models without implementable software, on proprietary datasets that restrict independent reconstruction, or lack validated prototypes in the Indonesian disaster context — three gaps that persist across the disaster IS literature. This study presents a three-tier web-based disaster logistics management IS integrating GIS and MILP optimization, built exclusively on public data sources (BNPB DIBI and OpenStreetMap). Using Design Science Research (DSR) across five phases, the system employs an open-source stack: Laravel 11.x presentation layer, PostgreSQL 16/PostGIS data layer, and Python FastAPI as a dedicated MILP microservice. The MILP model, a two-phase lexicographic MILP formulation with trips-aware vehicle capacity constraints is solved using the PuLP 3.3.0 + CBC solver. Three integrated modules were developed: shelter management, warehouse inventory, and logistics coordination with GIS visualization. Functional testing achieved 100% pass rate across 85 automated test cases covering all system modules, with 246ms mean response time under 50 concurrent users. The MILP solver resolved a 20-shelter problem in 0.094 seconds (99.9% below the 120-second operational planning threshold); scalability testing confirms tractability from 10 to 50 shelters (0.011–0.111 seconds), with Priority-1 shelters consistently served under both sufficient and scarce fleet conditions. Sensitivity analysis confirms lexicographic priority objectives activate correctly under resource scarcity. Comparative evaluation against heuristic and metaheuristic approaches confirms exact MILP is appropriate for the strategic planning scope of this proof-of-concept (n ≤ 50 shelters). Expert validation via ISO 25010 yielded a weighted score of 4.21/5. Usability testing with 25 participants produced a SUS score of 74.8 (Grade B, above-average per established SUS benchmarks) with 88% task completion rate. The primary contributions are a MILP-IS microservices integration pattern with explicit API specification, a comprehensively documented public-data-only implementation framework, and a proof-of-concept that closes the implementation gap between disaster logistics optimization research and operational IS deployment.
Co-Authors Aceng Sambas Ajib Susanto Aprilyani Nur Safitri Daniel Nomolas Wicaksono Danny Oka Ratmana De Rosal Ignatius Moses Setiadi Filmada Ocky Saputra Ifan Rizqa Mohamad Afendee Mohamed Muhammad Syaifur Rohman Saraswati, Galuh Wilujeng