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All Journal Jurnal Elektro dan Telkomunikasi Journal of Computer Science, Information Technology and Telecommunication Engineering (JCoSITTE)
alkho warizmi
Universitas Muhammadiyah Sumatera Utara
Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering

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Pemanfaatan Kriptografi Klasik dalam Steganografi Untuk Pengamanan Pesan Cikal Bakal Perkembangan IoT: a Literature Review alkho warizmi
Jurnal Elektro dan Telkomunikasi Vol 5 No 2 (2018): Jurnal Teknik Elektro dan Telkomunikasi
Publisher : UNIVERSITAS PEMBANGUNAN PANCA BUDI

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Abstract

Steganografi adalah metode memasukkan pesan ke media lain dengan isi tujuan kerahasiaan pesan dan menghindari pihak kecurigaan yang tidak berkepentingan. Metode ini sangat mudah untuk menerapkan, tapi metodesudah sangat umum dan mudah dipecahkan. Sehingga keamanan dari metode ini adalah tidak baik lagi. Dalam penelitian ini, penulis menggabungkan steganografi dengan metode kriptografi Caesar Cipher, di mana pesan akan dimasukkan pertama dienkripsi menggunakan Cipher Caesar. Hasil enkripsi ini kemudian dimasukkan ke dalam media gambar digital. Dengan penggabungan dua metode ini, maka pesan akan sulit untuk memecahkan, karena memiliki dua tingkat keamanan. Dari hasil dapat ditarik beberapa kesimpulan, antara lain, menggunakan kombinasi metode caesar kriptografi cipher dan metode steganografi, terlihat sama dengan gambar asli sebagai steganography hanya mengubah piksel merah. Pengujian kualitas gambar menunjukkan bahwa MSE dari citra yang sangat kecil, yang berarti bahwa citra tingkat kesalahan sangat kecil. Sedangkan nilai PSNR cukup besar, yang berarti bahwa hasil kualitas gambar yang lebih baik. Dalam proses enkripsi pesan, nilai kunci yang berbeda akan menghasilkan ciphertext yang berbeda.
Optimizing Lecturer Performance Assessment through Web-Based Application Design and Deployment Solly Aryza; Zulkarnain Lubis; Alkho Warizmi
Journal of Computer Science, Information Technology and Telecommunication Engineering Vol 7, No 1 (2026)
Publisher : Universitas Muhammadiyah Sumatera Utara, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/jcositte.v7i1.26501

Abstract

The evaluation of lecturer performance is a critical process in higher education, directly influencing academic quality, institutional reputation, and continuous improvement in teaching outcomes. Conventional evaluation methods, often paper-based or fragmented digital systems, face challenges such as inefficiency, lack of transparency, and limited accessibility. To address these issues, this research presents the design and deployment of a web-based application for lecturer performance assessment, aimed at optimizing the evaluation process through automation, standardization, and real-time data access. The system was developed using a structured software development life cycle (SDLC) approach, combining requirements analysis, database design, user interface prototyping, and iterative testing. Key features of the application include secure data management, multi-role access (administrators, lecturers, students), automated scoring mechanisms, and interactive dashboards for performance visualization. The evaluation of system usability was conducted using the System Usability Scale (SUS), achieving an average score of 82.5, which indicates high user acceptance and effectiveness. Results show that the proposed web-based system significantly improves efficiency by reducing evaluation processing time by up to 65% compared to manual methods. Furthermore, the integration of real-time analytics enhances decision-making for academic leaders in designing lecturer development programs. This research demonstrates that a well-structured web-based application can play a vital role in ensuring transparency, accountability, and continuous quality improvement in higher education institutions.Keywords: Lecturer performance evaluation, web-based application, higher education, system usability, academic quality assurance. 
Co-Authors Solly Aryza