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All Journal Djtechno: Jurnal Teknologi Informasi Journal of Intelligent Systems and Information Technology Jurnal Teknologi Rekayasa Informasi dan Komputer
Yandi Anzari
Universitas Jambi
Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Engineering

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EVALUASI KINERJA KOMPUTASI DAN KRIPTANALISIS BRUTE FORCE PADA ALGORITMA CAESAR CIPHER BERBASIS PYTHON Yandi Anzari; Ezrifal Sany; Lucy Simorangkir; Muh Subhan; Aulia Rachmawati; Suroto Suroto
Djtechno: Jurnal Teknologi Informasi Vol 6, No 3 (2025): Desember
Publisher : Universitas Dharmawangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46576/djtechno.v6i3.8076

Abstract

Dalam lanskap keamanan informasi modern, evaluasi terhadap ketahanan algoritma kriptografi klasik tetap memegang peranan vital sebagai landasan studi komputasi dan kriptanalisis. Penelitian ini menyajikan analisis forensik kuantitatif terhadap kinerja komputasi dan kerentanan keamanan algoritma Caesar Cipher menggunakan implementasi berbasis Python. Melalui pendekatan eksperimental terkendali, penelitian ini mengukur latensi enkripsi dan efektivitas serangan Brute Force pada dua skenario beban kerja: dataset teks pendek (118 karakter) dan dataset teks panjang (966 karakter). Hasil pengujian empiris menunjukkan bahwa algoritma ini memiliki efisiensi komputasi yang superior dengan waktu enkripsi rata-rata di bawah 1 milidetik. Namun, analisis statistik membuktikan adanya pemetaan frekuensi karakter yang bijektif (one-to-one mapping), yang menegaskan kegagalan algoritma dalam menerapkan prinsip pengaburan (confusion). Lebih lanjut, pengujian serangan Brute Force memvalidasi hipotesis linearitas kompleksitas waktu (O(N)), di mana peningkatan volume data sebesar 8,1 kali berkorelasi dengan peningkatan durasi serangan sebesar 9,6 kali. Dengan waktu pemecahan sandi rata-rata hanya 0,0127 detik untuk teks panjang, penelitian ini menyimpulkan bahwa Caesar Cipher memiliki margin keamanan yang dapat diabaikan (negligible) terhadap kapasitas komputasi modern, sehingga hanya relevan sebagai instrumen pedagogis dalam kurikulum keamanan siber.
PENERAPAN ALGORITMA K-MEANS UNTUK KLASTERISASI POLA IKLIM STUDI KASUS: PROVINSI JAMBI PERIODE 2020-2024 Yandi Anzari; M. Yonggi Puriza; Niko Akbar; Nurul Abdillah; Oki Dahwanu; Elsi Alfionita Syawal
Djtechno: Jurnal Teknologi Informasi Vol 6, No 3 (2025): Desember
Publisher : Universitas Dharmawangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46576/djtechno.v6i3.7994

Abstract

Penelitian ini menerapkan algoritma K‑Means untuk mengidentifikasi pola iklim dominan di Provinsi Jambi pada periode Januari 2020 sampai Desember 2024. Dataset bulanan berjumlah 60 observasi yang memuat enam variabel meteorologi: curah hujan, suhu rata‑rata, suhu maksimum, suhu minimum, kecepatan angin, dan kelembaban relatif. Data diagregasi dari data harian menjadi bulanan dan dipra‑proses dengan standardisasi Z‑Score untuk mengatasi heterogenitas skala antar fitur. Penentuan jumlah klaster optimal dilakukan secara kuantitatif menggunakan Elbow Method berdasarkan nilai inersia, yang menunjukkan titik belok pada k=3. Model K‑Means diinisialisasi secara acak dan dijalankan dengan beberapa pengulangan untuk menilai stabilitas hasil; keluaran divisualisasikan dalam proyeksi 2D dan 3D untuk memudahkan interpretasi spasial. Analisis centroid mengidentifikasi tiga rezim iklim: rezim kering/transisi (curah hujan rendah dan suhu relatif tinggi), rezim monsonal normal (curah hujan menengah‑tinggi dan kelembaban tinggi), serta rezim basah ekstrem (curah hujan sangat tinggi dan kelembaban tinggi). Hasil ini menyediakan tipologi iklim berbasis data yang relevan untuk perencanaan pertanian, mitigasi bencana hidrometeorologi, dan kebijakan adaptasi iklim di tingkat provinsi.
Security and Performance Analysis of Caesar and Vigenère Ciphers Yandi Anzari; Teuku Djauhari; Tomi kurniawan; Noni Rahmawati; Niko Akbar
Journal of Intelligent Systems and Information Technology Vol. 3 No. 2 (2026): July
Publisher : Apik Cahaya Ilmu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61971/jisit.v3i2.320

Abstract

While most cryptographic benchmarks prioritize modern algorithms, this study offers a distinct, controlled evaluation of classical monoalphabetic versus polyalphabetic substitution ciphers under systematically scaled data workloads up to 1,000 KB. The objective is to quantify the exact execution throughput and security thresholds of the Caesar and Vigenère ciphers against contemporary automated attacks. The methodology utilizes programmatically built Python modules tested across 100 continuous trials inside an isolated Linux environment, subjected to automated brute-force scripts and statistical Kasiski examinations. The empirical results reveal that both algorithms exhibit linear time complexity, though the Vigenère cipher suffers a 38% to 45% performance overhead due to index alignment. Crucially, while the Vigenère cipher successfully deters primitive brute-force attacks, its structural security collapses catastrophically with a 100% vulnerability rate under statistical cryptanalysis once the file size reaches 50 KB. The practical implication dictates that polyalphabetic substitution provides superficial protection against modern computing power, reinforcing institutional policy to restrict these foundational algorithms exclusively to pedagogical frameworks rather than active information systems.
Design of a Boarding House Information System (SIKOST) Using the TOGAF Architecture Development Method (ADM) Framework Muh Subhan; Aulia Rachmawati; Nurul Abdillah; Yandi Anzari
Jurnal Teknologi Rekayasa Informasi dan Komputer Vol 9, No 2 (2026)
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jtrik.v9i2.10736

Abstract

Conventional boarding house information management faces various challenges, ranging from inefficient room-search processes and inaccurate tenant data to limited integration among subsystems. This study aims to design an enterprise architecture for a web-based Boarding House Information System (SIKOST) using the TOGAF (The Open Group Architecture Framework) with the ADM (Architecture Development Method) approach. The design process was conducted through four main phases of TOGAF ADM: Architecture Vision (Phase A), Business Architecture (Phase B), Information Systems Architecture (Phase C), and Technology Architecture (Phase D). The research employed a mixed-method approach combining quantitative and qualitative methods with a literature review. The results produced a comprehensive SIKOST enterprise architecture blueprint, consisting of a business architecture with 12 main processes, a data architecture with 15 entities, an application architecture with 4 functional domains, and a technology architecture based on Laravel and MySQL. Validation using User Acceptance Testing (UAT) with 30 respondents resulted in a satisfaction score of 86.4%, which falls into the very good category.
Co-Authors Aulia Rachmawati Djauhari, Teuku Elsi Alfionita Syawal Ezrifal Sany Lucy Simorangkir M. Yonggi Puriza Muh Subhan Muh. Subhan Niko Akbar Noni Rahmawati Nurul Abdillah Oki Dahwanu Rachmawati, Aulia Suroto suroto Tomi kurniawan