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Neno, Friden Elefri
STIMIKOM Stella Maris
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Journal : Bulletin of Network Engineer and Informatics (BUFNETS)

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Improving Classical Playfair Cipher Security Using Genetic Algorithm-Based Key Optimization Pawan, Elvis; Elefri Neno, Friden; Yuliana, Yuliana; Dwi Febriana, Putri; Da Awendu, Damianus
Bulletin of Network Engineer and Informatics Vol. 4 No. 1 (2026): BUFNETS (Bulletin of Network Engineer and Informatics) April - September 2026
Publisher : PT. GWEX NET PUBLISHER

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59688/s1567c81

Abstract

Even though the need for data security is growing, the standard Playfair Cipher algorithm can still be broken by frequency analysis. This is why this study was done. Ciphertext patterns that are easy to guess are a big problem because they make things less safe. This is especially true for the Playfair Cipher, which can be broken into by frequency analysis if it isn't properly protected. To make things safer, it is important to use stronger encryption methods and update the key management process on a regular basis. As part of designing the algorithm, building the system, and testing how well the cryptosystem works, you need to change the structure of the matrix and shuffle the keys on the fly. The test showed that the time it took to encrypt went up from 12.0 milliseconds to 14.2 milliseconds (+2.2 milliseconds or +18.33%), but the accuracy of the decryption stayed at 100%. The random index value also rose from 0.03636 to 0.06061. This means that the ciphertext is getting more random. The results show that making changes to the Playfair Cipher can make it a lot safer while still keeping it fast enough
Co-Authors Achmad Yusron Arif Adis, Alexander Ajeng Kalista Rahma Akrilvalerat Deainert Wierfi Alex Talu Popo Andreas Ariyanto Rangga Arif, Achmad Yusron Ayu, Mitra Permata Bheni Mane, Helena Da Awendu, Damianus Damar Suryo Sasono Dappa Ege, Emerensiana Dian Fransiska Ledi Dony Ariyus Dony Ariyus Dwi Febriana, Putri Efraim Resi Ngara, Indrawanto Ege, Emirensiana Dappa Ema Ose Sanga, Felysistas Emirensiana Dappa Ege Fandli Supandi Felysitas Ema Ose Sanga Fransiska Ledi, Dian Gergorius Kopong Pati Gregorius Bora, Aloysius Henderi . Henderi Henderi Ina, Yulita Adi Inna Dodo, Notria Jenifer Laura Patrisyah Rumpaisum Kaba Leilu, Florentina Kalli Ghoba, Apliana Katarina Yunita Riti Kusrini Kusrini Kusrini Kusrini Kusrini Kusrini Lali Momo, Lidia Lende, Erniati Lende, Renita Litbagai, Ektoreda Malu Wemu, Sugiarto Maramba Jawa, Antar Maria Bouk, Yemi Maria Herlinda Bora Maria Imakulata Malo Marthin Safrio Dhogo, Aplrilianus Milla Ate, Kornelia Ng Tate, Oktavianus Ngilanyanyi, Paulus Ngongo Ngaba, Paulus Ngongo, Andrianus Ngongo, Tobias Novebriana Putri Dendo Oktavianus Yengu, Mario Patmawati Hasan Paulus Apostolus Wangga Paulus Mikku Ate Paulus Mikku Ate, Paulus Mikku Pawan, Elvis Permata Ayu, Mitra Petro Ama Kii, David Petrus I.S. Lemu Pora Ina, Anjelina Pora, Estiana Astuti Priskila Wanda, Friska Rambu Y Dangga, Anastasia Rato, Karolus Wulla Reby Sabawaly, Diana Regina Bali Ate Robo, Salahudin Setiawi, Agustina Purnami Talo Popo, Alexander Tetik, Yulius Nahak Titus Kurra Umar, Elfira Umbu Kii, Ikson Waang Bler Tuang, Soleman Wilda Malo, Maria Woli, Dorkas Wulla Rato, Karolus Yuliana Yuliana Yulius Nahak Tetik Yuni Ambar Setianto