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All Journal Journal of Research and Publication Innovation Cosmic Jurnal Teknik
Ibnu Rusydi
Universitas Islam Negeri Sumatera Utara
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Social Sciences Other

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Aplikasi Simulasi Enkripsi Menggunakan Metode Caesar Cipher Berbasis Website Fiqri Dian Priyatna Sinaga; Khoiratul Azmi; Afri Yunda Nasution; Rivaldi Prima Nanda; Ibnu Rusydi
Cosmic Jurnal Teknik Vol 2 No 4 (2025): November
Publisher : Ali Institute or Research and Publication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55537/cosmic.v2i4.1466

Abstract

Cryptography is a fundamental field in data security; however, it is often considered difficult for beginner students due to its abstract and mathematical nature. Previous studies indicate that learning Caesar Cipher is commonly conducted through theoretical approaches or desktop-based applications with limited interactivity and accessibility. Therefore, this study aims to develop a web-based Caesar Cipher encryption simulation application as an interactive learning medium. The system was developed using the prototype method, while functional testing was conducted using the black box testing approach. The effectiveness of the application was evaluated through primary data collected through questionnaires distributed to students. The results show that before using the application, 82.4% of students were at low to moderate levels of understanding, whereas after using the application, 100% of students reached a high level of understanding. These findings indicate that the web-based Caesar Cipher simulation application is effective in improving students’ understanding of fundamental cryptographic concepts prior to studying more advanced data security algorithms
PERBANDINGAN ALGORITMA DES, AES, IDEA, DAN BLOWFISH BERDASARKAN PANJANG KUNCI DAN CIPHERTEXT SEBAGAI INDIKATOR KEAMANAN DATA Faqih Rifaldy; Hans Pran Limbong; Maulana Firjatullah; Rafli Arya Gading; M Irsan Prayoga; Ibnu Rusydi
Journal of Research and Publication Innovation Vol 4 No 1 (2026): JANUARY
Publisher : Journal of Research and Publication Innovation

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The rapid growth of information technology has increased the need for secure data transmission, making cryptography a fundamental component of computer security systems. Symmetric cryptographic algorithms play an important role in protecting data confidentiality by transforming plaintext into ciphertext that is difficult to interpret by unauthorized parties. This study aims to compare the symmetric cryptographic algorithms DES, AES, IDEA, and Blowfish based on key length and ciphertext length as indicators of data security. The research utilizes a dataset consisting of 120,000 encryption records containing information on algorithm type, key length, and ciphertext length. The analysis is conducted using a descriptive comparative approach to evaluate differences in security characteristics among the algorithms. Key length is analyzed as an indicator of resistance to brute-force attacks, while ciphertext length is examined to assess encryption complexity and data transformation behavior. The results show that DES has the shortest key length and produces relatively less complex ciphertext, indicating lower security. IDEA demonstrates moderate security characteristics, while AES and Blowfish exhibit larger and more flexible key lengths along with more varied ciphertext patterns. These characteristics suggest that AES and Blowfish provide higher security compared to DES and IDEA. This study concludes that key length and ciphertext characteristics can be used as preliminary indicators in evaluating the relative security of symmetric cryptographic algorithms. However, this research does not include performance testing or cryptanalysis simulations, which can be explored in future studies.
Co-Authors Afri Yunda Nasution Faqih Rifaldy Fiqri Dian Priyatna Sinaga Hans Pran Limbong Khoiratul Azmi M Irsan Prayoga Maulana Firjatullah Rafli Arya Gading Rivaldi Prima Nanda