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All Journal Jurnal Masyarakat Informatika 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): JURNAL MASYARAKAT INFORMATIKA
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.
Co-Authors Aceng Sambas Ajib Susanto Aprilyani Nur Safitri Daniel Nomolas Wicaksono De Rosal Ignatius Moses Setiadi Ifan Rizqa Mohamad Afendee Mohamed