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All Journal Wahana Matematika dan Sains Kreano, Jurnal Matematika Kreatif-Inovatif Syntax Literate: Jurnal Ilmiah Indonesia JUTIK : Jurnal Teknologi Informasi dan Komputer METHOMIKA: Jurnal Manajemen Informatika & Komputerisasi Akuntansi Contagion: Scientific Periodical Journal of Public Health and Coastal Health International Journal of Advances in Data and Information Systems Jurnal Pengabdian Masyarakat Asia
Agus Adi Putrawan
Politeknik Negeri Bali
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Pemanfaatan Ekstensi PRF WebAuthn untuk Pembungkusan Kunci Privat Sisi Klien pada Penandatanganan Transaksi Offline Hyperledger Fabric: Purwarupa dan Evaluasi Kelayakan I Made Prajna Paramahansa Satriagama; I Nyoman Gede Arya Astawa; Agus Adi Putrawan
METHOMIKA: Jurnal Manajemen Informatika & Komputerisasi Akuntansi Vol. 10 No. 2 (2026): METHOMIKA: Jurnal Manajemen Informatika & Komputersisasi Akuntansi
Publisher : Universitas Methodist Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46880/jmika.Vol10No2.pp607-621

Abstract

Private key management remains a practical barrier to adopting consortium blockchains such as Hyperledger Fabric, where transactions must be signed with the ECDSA private key associated with an X.509 certificate. Server custody simplifies implementation but creates a single point of compromise, whereas delegating key files to users reduces usability and raises key-loss risk. This study proposes and evaluates a non-custodial prototype that uses the WebAuthn Pseudo-Random Function (PRF) extension to derive a client-side key-wrapping key. Unlike existing Fabric key management (file-based wallets, server custody, or HSM/PKCS#11) and prior WebAuthn PRF uses that mainly encrypt user data, this work combines PRF-derived key wrapping, envelope encryption, and Fabric offline signing to protect rather than replace the ECDSA signing key. The ECDSA P-256 key is generated in the browser and protected by envelope encryption: it is encrypted with a random Data Encryption Key (DEK, AES-256-GCM), while the DEK is wrapped with a Key Encryption Key derived from PRF output via HKDF-SHA256. The server stores only ciphertexts and the user certificate. During submission, the key is briefly decrypted in browser memory for client-side offline signing before being sent to the Fabric network. Evaluation with the asset-transfer-basic chaincode shows that browser-signed transactions are accepted and validated without exposing the plaintext private key to the server. Average cryptographic overhead is 0.248 ms (SD 0.022 ms). It remains feasible for interactive use, although PRF support remains uneven across authenticators. This study is a proof of concept for technical feasibility, not a comprehensive security analysis.
Perancangan Aplikasi Website Booking Barbershop pada Reza Barbershop Menggunakan Metode User Centered Design I Made Sandi Putrawan; Agus Adi Putrawan; Luh Gede Putri Suardani
METHOMIKA: Jurnal Manajemen Informatika & Komputerisasi Akuntansi Vol. 10 No. 2 (2026): METHOMIKA: Jurnal Manajemen Informatika & Komputersisasi Akuntansi
Publisher : Universitas Methodist Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46880/jmika.Vol10No2.pp582-596

Abstract

Reza Barbershop is a men's hair care service located in Padang Sambian, Denpasar, Bali, which still relies on a manual booking process. Customers are required to visit the barbershop directly or contact staff through personal phone numbers to make reservations, resulting in inefficient service, longer waiting times, and potential customer dissatisfaction. This study aims to develop a web-based booking system using the User Centered Design (UCD) approach to improve the booking process and enhance service quality. The development process consisted of identifying user requirements, designing the user interface, implementing the system using the Laravel framework and MySQL database, and evaluating the developed application. Functional testing was conducted using Black Box Testing, while usability evaluation was performed using the System Usability Scale (SUS) involving 30 respondents. The results indicate that all system functionalities operated successfully according to user requirements. Furthermore, the usability evaluation achieved an average SUS score of 82.67, corresponding to Grade A, an Excellent adjective rating, and an Acceptable level of usability. These findings demonstrate that the proposed web-based booking system provides a high level of usability and effectively supports customers in making online reservations while improving operational efficiency and service management at Reza Barbershop.
Pengembangan Sistem Pendaftaran Magang Berbasis Website Menggunakan Metode Simple Additive Weighting pada PT Foxbyte Global Inovasi Gede Agus Aditya Dharma Serna Putra; Agus Adi Putrawan; I Putu Bagus Arya Pradnyana
METHOMIKA: Jurnal Manajemen Informatika & Komputerisasi Akuntansi Vol. 10 No. 2 (2026): METHOMIKA: Jurnal Manajemen Informatika & Komputersisasi Akuntansi
Publisher : Universitas Methodist Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46880/jmika.Vol10No2.pp672-680

Abstract

PT Foxbyte Global Inovasi (FGI) is a technology company in Bali that offers internship Programs for vocational high school and university students. However, the registration and selection process for interns at this company is still conducted manually using physical forms and Microsoft Excel. This conventional system causes various obstacles, such as slow data processing, a high risk of document loss, and subjectivity or bias in candidate evaluation. This study aims to develop a web-based internship registration information system named FoxPath to improve the efficiency, accuracy, and transparency of the intern recruitment process. This system applies the Simple Additive Weighting (SAW) method as a decision support system to objectively rank participants based on academic scores (40%), interview results (30%), and Curriculum Vitae (CV) evaluation (30%). The system development followed the Waterfall Model, integrating the ReactJS library on the Frontend, the Laravel Framework on the Backend, and MySQL as the database management system. System testing was conducted using Black box Testing to ensure that feature functionalities run according to requirement specifications. The results show that the FoxPath system successfully processes registration data, normalizes criteria matrices, and displays ranking results accurately in accordance with manual calculations. This system successfully transforms the internship administration process into a digital platform, accelerates decision-making for HRD, and automatically dispatches graduation notifications via email.
Pengembangan Aplikasi Kakao Assistant Berbasis Flutter dan Large Language Model sebagai Asisten Virtual Petani Kakao di Bali I Nyoman Rai Widartha Kesuma; Luh Gede Putri Suardani; Agus Adi Putrawan; I Putu Astya Prayudha
METHOMIKA: Jurnal Manajemen Informatika & Komputerisasi Akuntansi Vol. 10 No. 2 (2026): METHOMIKA: Jurnal Manajemen Informatika & Komputersisasi Akuntansi
Publisher : Universitas Methodist Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46880/jmika.Vol10No2.pp991-1001

Abstract

Cocoa (Theobroma cacao L.) represents a strategic agricultural commodity supporting rural smallholder livelihoods across Bali Province, notably in Tabanan, Jembrana, Gianyar, and Buleleng regencies. Nevertheless, farm productivity and bean quality remain severely threatened by Cocoa Pod Borer (Conopomorpha cramerella), Helopeltis sp., and black pod rot (Phytophthora palmivora), exacerbated by the limited availability of agricultural extension officers in remote rural areas. This study develops Kakao Assistant, a cross-platform mobile virtual assistant built on Flutter integrating Google Gemini 3.1 Flash Large Language Model (LLM) under a single-role architecture dedicated to Cocoa Farmers. System development follows the Modified Waterfall lifecycle comprising requirements analysis, system architecture design, implementation, and empirical testing. The application provides multimodal agronomic consultations (text inquiries and pod disease image diagnostics), regional agroclimatic contextualization for Bali plantations, Text-to-Speech (TTS) voice synthesis, message bookmarking, and an on-device model evaluation module ensuring transparency of artificial intelligence inferences. Black-box testing validated that 100% of the 11 functional scenarios functioned in strict compliance with system specifications. Prototype testing verified the module's capability to track response latency, network fault resilience, and local FIFO history logs prior to extensive community deployment across Bali cocoa farms.
Co-Authors Anak Agung Putri Indrayanti Apsari, Ratih Ayuni, Dewinta Dewi Kartika Sari Diadjeng Setya Wardani Elfarosa, Ketut Vini Gde Brahupadhya Subiksa Gede Agus Aditya Dharma Serna Putra Gusti Ngurah Senja Ghautama I Gde Agus Jaya Sadguna I Gusti Agung Mas Krisna Komala Sari I Gusti Ngurah Agung Dwijaya Saputra I Kadek Nova Hary Saputra I Made Prajna Paramahansa Satriagama I Made Riyan Adi Nugroho I Made Sandi Putrawan I Nyoman Gede Arya Astawa I Nyoman Rai Widartha Kesuma I Putu Agus Sugiantara I Putu Astya Prayudha I Putu Bagus Arya Pradnyana I Putu Oka Wisnawa I Wayan Agung Indrawan I Wayan Suasnawa Indrawan, I Kadek Surya Luh Gede Putri Suardani Made Pasek Agus Ariawan Ni Ketut Pradani Gayatri Sarja Ni Luh Ayu Kartika Yuniastari Sarja Ni Made Sintya Rani Putu Sudewi Arsini Sri Andarini Sugirianta, Ida Bagus Ketut Yasa, I Made Sumerta