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All Journal Elkom: Jurnal Elektronika dan Komputer Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Sahyunan Harahap
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Education Electrical & Electronics Engineering Engineering Mechanical Engineering

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Enkripsi Homomorfik Parsial untuk Mendukung Pencarian Data Terenkripsi pada Basis Data Relasional Niko, Niko Surya Atmaja; Surya Atmaja, Niko; Muhammad Khoiruddin Harahap; Sahyunan Harahap
Elkom: Jurnal Elektronika dan Komputer Vol. 18 No. 2 (2025): Desember : Jurnal Elektronika dan Komputer
Publisher : STEKOM PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/elkom.v18i2.3312

Abstract

Relational databases store information in interconnected tables and are widely used for data management and retrieval. However, in certain environments, the original values stored in a relational database cannot be exposed during data retrieval. This limitation creates a challenge because common encryption methods only transform data for storage and do not support mathematical operations needed for value matching. Partially Homomorphic Encryption is a cryptographic approach that allows specific mathematical operations to be performed directly on transformed data without restoring it to its original form. This study proposes the use of Partially Homomorphic Encryption to enable value-based data retrieval while keeping all stored values in their transformed form throughout the entire process. The method relies on homomorphic properties that allow mathematical comparison to be conducted on encrypted data, making the retrieval process possible without revealing the original values. The results show that this approach can perform data retrieval operations in a relational database while preserving the transformed structure of the stored data. The proposed method offers an alternative for environments that require data retrieval without exposing original values and demonstrates the potential of homomorphic techniques in supporting secure and functional data processing in relational database contexts.
Perancangan Sistem Informasi Manajemen Jam Ganti Guru Menggunakan Round Robin Berbasis Web: Studi Kasus: SMK Parulian 2 Medan Tri Yulistiani Siregar; Niko Surya Atmaja; Sahyunan Harahap
Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer Vol. 6 No. 2 (2026): Juli: Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/juritek.v6i2.7575

Abstract

SMK Parulian 2 Medan is a vocational school with 20 teachers managing 6 classes and a total of 180 teaching hours per week. The management of teacher substitution hours is currently still carried out based on direct considerations without using a structured mechanism. This condition gives rise to several problems, namely poorly organized teacher schedule data, the process of determining substitute teachers that takes quite a long time so that it can disrupt teaching and learning activities, and the distribution of substitute hours that is not evenly distributed among teachers. This study aims to design a web-based application for managing teacher substitution hours that is able to organize data in a structured manner, implement fair rotations in the assignment of substitute teachers, and present schedule information that is easily accessible. The proposed method is the Round Robin algorithm, which distributes substitute hour assignments in turns based on a certain order so that each teacher has an equal opportunity to receive additional teaching assignments. The resulting design allows for structured storage of teacher and schedule data in a database, automation of substitute teacher determination using the Round Robin mechanism, and presentation of information through a web-based interface that can be accessed by school administration staff. Compared to the current management method, the design offers more organized data management, faster replacement teacher assignments, and a more balanced distribution of teaching loads. This study concludes that web-based replacement teacher management integrated with the Round Robin algorithm can effectively address scheduling issues at SMK Parulian 2 Medan and improve the continuity of teaching and learning activities
Co-Authors Muhammad Khoiruddin Harahap Niko Surya Atmaja Niko, Niko Surya Atmaja Surya Atmaja, Niko Tri Yulistiani Siregar