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All Journal Jatilima : Jurnal Multimedia Dan Teknologi Informasi Journal of Computer Science and Informatics Engineering Switch: Jurnal Sains dan Teknologi Informasi
Lotar Mateus Sinaga
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Computer Science & IT

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Analisis Keamanan SSH dengan Menggunakan Algoritma ECDSA pada Server Debian Lotar Mateus Sinaga; Pandi Barita Nauli Simangunsong
Jurnal Multimedia dan Teknologi Informasi (Jatilima) Vol. 7 No. 5 (2026): Jatilima : Jurnal Multimedia Dan Teknologi Informasi
Publisher : Cattleya Darmaya Fortuna

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54209/jatilima.v7i5.2146

Abstract

Dalam era digital yang semakin kompleks, kebutuhan akan koneksi jarak jauh yang aman menjadi prioritas utama dalam pengelolaan sistem. Penelitian ini mengkaji implementasi dan evaluasi autentikasi Secure Shell (SSH) menggunakan algoritma Elliptic Curve Digital Signature Algorithm (ECDSA) pada sistem operasi Debian. Metode penelitian yang digunakan adalah studi kasus eksperimental dalam lingkungan jaringan lokal yang dikendalikan oleh router MikroTik, dengan pengujian pada sisi server dan client, serta simulasi ancaman keamanan. Hasil penelitian menunjukkan bahwa penggunaan autentikasi berbasis kunci publik ECDSA berhasil mengeliminasi kebutuhan password, mencegah serangan brute force, dan menjaga integritas koneksi melalui enkripsi yang kuat. Audit konfigurasi menunjukkan bahwa server menggunakan kurva NIST P-521, yang meskipun aman secara teknis, masih menimbulkan diskusi terkait transparansi kriptografi. Simulasi sniffing membuktikan bahwa komunikasi melalui SSH terenkripsi secara menyeluruh, tanpa kebocoran data sensitif. Dengan demikian, autentikasi SSH berbasis ECDSA terbukti sebagai pendekatan yang efektif dan layak diterapkan untuk meningkatkan keamanan koneksi jarak jauh, dengan catatan evaluasi algoritma secara berkala tetap diperlukan untuk menjawab tantangan keamanan yang terus berkembang.
Analisis Efektivitas Failover Server Debian Menggunakan Heartbeat Cluster Theresya Simanjuntak; Jelita Astrid Gulo; Lotar Mateus Sinaga
Switch : Jurnal Sains dan Teknologi Informasi Vol. 4 No. 4 (2026): Juli : Switch : Jurnal Sains dan Teknologi Informasi
Publisher : Asosiasi Profesi Telekomunikasi Dan Informatika Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62951/switch.v4i4.932

Abstract

Service continuity is a critical requirement in modern network infrastructure, since even a brief interruption on a primary server can directly disrupt end-user access. This study examines the effectiveness of a failover mechanism built with Heartbeat Cluster on a Debian-based server environment. A two-node architecture was configured, consisting of Node1 as the primary (master) server and Node2 as the backup server, both monitored through Heartbeat to manage the automatic migration of a Virtual IP Address (VIP) whenever the primary node becomes unreachable. Testing was carried out by deliberately shutting down Node1 and measuring the time required for the system to transfer services to Node2 across six independent trials. The results show that Heartbeat consistently detected the failure and redirected the VIP without manual intervention, keeping the web service accessible with only a brief interruption; the average failover time recorded was 14.41 seconds. The system also performed a successful failback once Node1 was restored. These findings confirm that Heartbeat Cluster is an effective and low-cost approach for improving service availability on Debian servers, particularly for small-scale or educational network environments with limited infrastructure budgets.
Detection of SSH Brute Force Attacks Based on System Logs in Debian 12 Serliana Barutu; Rasit Junaedi Silalahi; Lotar Mateus Sinaga
Journal of Computer Science and Informatics Engineering Vol 5 No 3 (2026): July
Publisher : Ali Institute of Research and Publication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55537/cosie.v5i3.1767

Abstract

The Secure Shell (SSH) service on Linux servers is frequently targeted by brute-force attacks. This study aims to outline the characteristics of authentication logs generated when the Debian 12 operating system faces such attacks. An experimental method was applied within a local network using a Debian 12 server as the target and Kali Linux as the attacker, with Hydra utilized as the tool to execute the attack. The experiments were conducted across three scenarios based on the volume of attack attempts: 10, 100, and 500 login attempts, while the Fail2Ban service was deactivated. Data analysis was performed quantitatively and descriptively, using Success Rate and Failed Login Rate metrics derived from records in journalctl and auth.log. The test results indicate that a higher attack volume corresponds to a larger amount of generated logs. In a scenario involving a success rate of 0.2%, only 1 password was accepted. The study also identified limitations in OpenSSH sessions (reaching the maximum authentication attempt limit), though Hydra was able to initiate new sessions automatically. Therefore, the system records detailed abnormalities without data loss, making it highly suitable as a primary foundation for server security audits
Co-Authors Jelita Astrid Gulo Rasit Junaedi Silalahi Serliana Barutu Simangunsong, Pandi Barita Nauli Theresya Simanjuntak