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All Journal Jurnal Nasional Teknologi Informasi dan Aplikasinya
I Made Chandra Widjaya
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Computer Science & IT Engineering

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Penerapan Enkripsi dan Dekripsi Dokumen Data UMKM Menggunakan Algoritma ChaCha20-Poly1305 I Made Chandra Widjaya; I Komang Ari Mogi
Jurnal Nasional Teknologi Informasi dan Aplikasinya Vol. 3 No. 1 (2024): JNATIA Vol. 3, No. 1, November 2024
Publisher : Informatics Department, Faculty of Mathematics and Natural Sciences, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JNATIA.2024.v03.i01.p14

Abstract

Despite the increasing importance of data security in safeguarding sensitive information, this study addresses the potential risks associated with unauthorized access to critical data. Employing the ChaCha20-Poly1305 algorithm, the research focuses on implementing encryption and decryption processes for Small and Medium Enterprise (SME) documents, supplemented by key derivation from AES-256 for enhanced security. A nonce Initialization Vector (IV) is generated using the ChaCha20-Poly1305 algorithm, with users inputting secret keys for encryption. The system then encrypts the data using the ChaCha-Poly1305 algorithm and derives keys from AES using SHA-256 hashing. For decryption, users input the encrypted document into the program, along with the previously used key. The system design employs a simple web-based application, with the ChaCha20-Poly1305 cryptography algorithm implemented in PHP. The study successfully tests the ChaCha20-Poly1305 algorithm, and the program exhibits secure decryption processes, evidenced by consistent byte sizes of tested SME documents. 
Co-Authors I Komang Ari Mogi