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All Journal JURNAL MEDIA INFORMATIKA BUDIDARMA Pendas : Jurnah Ilmiah Pendidikan Dasar IJISTECH (International Journal Of Information System & Technology) KOMIK (Konferensi Nasional Teknologi Informasi dan Komputer) The IJICS (International Journal of Informatics and Computer Science) JURIKOM (Jurnal Riset Komputer) Building of Informatics, Technology and Science JURNAL MAHAJANA INFORMASI JOURNAL OF INFORMATION SYSTEM RESEARCH (JOSH) Journal of Computer System and Informatics (JoSYC) Indonesian Journal of Data and Science Jurnal Pengabdian kepada Masyarakat Nusantara JiTEKH (Jurnal Ilmiah Teknologi Harapan) IJISTECH Bulletin of Computer Science Research Jurnal Saintekom : Sains, Teknologi, Komputer dan Manajemen Jurnal ABDIMAS Budi Darma TAMIKA: Jurnal Tugas Akhir Manajemen Informatika & Komputerisasi Akuntansi ORAHUA : Jurnal Pengabdian Kepada Masyarakat Pascal: Journal of Computer Science and Informatics Informatics Berbakti
Rivalri Kristianto Hondro
Universitas Budi Darma, Medan
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Journal : pascal journal of computer science and informatics

 1 
Layered Data Security Using Affine Cipher and Pixel Value Differencing Steganography Rivalri Kristianto Hondro
Pascal: Journal of Computer Science and Informatics Vol. 1 No. 01 (2023): Pascal: Journal of Computer Science and Informatics
Publisher : Devitara Innovations

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Abstract

This study presents a layered data-security design that combines Affine Cipher encryption with Pixel Value Differencing (PVD) image steganography. The first layer transforms plaintext into ciphertext using a monoalphabetic affine transformation, while the second layer conceals the ciphertext in neighboring image pixels according to local pixel differences. The method is reconstructed as a consistent Affine-PVD workflow and verified through deterministic worked examples rather than unsupported attack-success claims. Using the uppercase alphabet with keys a = 5 and b = 8, the plaintext “DATA” is transformed into “XIZI” and correctly recovered with the modular inverse. In the PVD verification, the pixel pair (100, 108) embeds the three-bit sequence 101 by changing the difference from 8 to 13, producing a valid modified pair (98, 111); extraction recovers the same bit sequence. These results confirm algorithmic reversibility of the two stages. The combined approach provides confidentiality and concealment as separate layers, but Affine Cipher remains a classical cipher and PVD is susceptible to steganalysis. Therefore, the design is appropriate as a prototype or instructional security model rather than a substitute for modern cryptographic protection.
Co-Authors Alwin Fau Amatilah Nasution Anda Yanny Andri, Ricky Ardi Kusuma Azlan Bagus Nur Ihwa Bister Purba Cici Oktaviani Dariusu Zebua Dennita Pasaribu Dermawan Lumban Toruan Dito Putro Utomo Eferoni Ndruru Efori Buulolo Erdina Daniati Simanjuntak Fadlina Fince Tinus Waruwu Ginting, Hendro Sutomo Guidio Leonarde Ginting Hanna Tresia Silalahi Harefa, Misael Oktavianda Hasibuan, Alima Hakkon Hery Sunandar Hts, Dedek Indra Gunawan Imam Saputra Imam Saputra Imam Saputra Imam Saputra Kenedi Tampubolon Kennedi Tampubolon Khairun Nathassa Kusnadi Lince Tomoria Sianturi Marto Sihombing Matanari, Supriyanti Minarni Pratama Muhammad Sayuthi Muhammad Syahrizal Muhammad Zainuddin Nasib Marbun Natalia Silalahi Ndruru, Eferoni Nelly Astuti Hasibuan Paulus Lubis, Paulus Pratama, Minarni Putri Ramadhani Rabli Hari Mulia Reka Safarti Rian Syahputra Ronda Deli Sianturi Rosmaida Rosmaida Rusmin Saragih, Rusmin Saragih, Windi Sri Utami Sari, Tetti Purnama Sari, Tetti Purnama Sarwandi Sihombing, Anton Simanjuntak, Peter Jaya Negara Sri Agustiani Br Siburian Sri Wulan Sri Wulan, Sri Suginam Sumiati Sumiati Supriyanti Matanari Suranta Bill Fatric Ginting Surya Darma Nasution Sylvia Situmorang T. Razeki Aditya Syahputra T. Rezka Aditya Syahputra Taronisokhi Zebua Torong, Adi Putra S. Wosvo Aritonang Wulan Ramadhani Yana, Gusri Indah Yusman Zalukhu Zalukhu, Yusman Zumrotul Aqobah Hsb