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All Journal Jurnal Bakti Masyarakat Indonesia Abdi Teknoyasa International Journal of Artificial Intelligence in Medical Issues PADIMAS: Jurnal Pengabdian Masyarakat Abdi Karya: Jurnal Pengabdian Kepada Masyarakat International Journal of Informatics and Computing
Randi Rizal
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Agriculture, Biological Sciences & Forestry Computer Science & IT Dentistry Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Health Professions Medicine & Pharmacology Public Health Social Sciences Other

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Journal : International Journal of Informatics and Computing

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Digitograph: A Mobile Digital Signatures Application for PDF file Using ED25519 and Asymmetric Encryption Annisa Putri Wahyuni; Arif Bramantoro; Randi Rizal; Souhayla Elmeftahi
JICO: International Journal of Informatics and Computing Vol. 1 No. 1 (2025): May 2025
Publisher : IAICO

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Digital signatures have become an essential tool in the digital era, providing a secure and efficient way to authenticate and verify the integrity of digital documents. The increasing need for remote and electronic transactions has led to a surge in the development of digital signature technology. This research presents a mobile application, Digitograph, designed to facilitate the process of digitally signing PDF files using ED25519 and Asymmetric Encryption. Several processes were employed to complete the Digitograph application, including a literature study to gather information and documents related to the development process. A research framework was prepared to ensure that the processes in the study were carried out in a directed and systematic manner. The development of the Digitograph application was successfully accomplished, with significant results demonstrating improvements in security, efficiency, and ease of use for digital signatures on PDF files. The following are some key aspects of the Digitograph application's development: 1) Enhanced security, 2) Performance and efficiency, 3) User-friendliness. Digital signatures using ED25519, and Asymmetric Encryption are one of the key technological applications in modern cryptography. ED25519 offers a high level of security, efficiency, and ease of use. This method enhances data security and significantly simplifies key management to address vulnerabilities in Asymmetric Encryption. The Digitograph application ensures the authenticity and integrity of documents, providing a practical solution in the digital era.
A Transform-Domain Robust Watermarking Model Using Discrete Wavelet Transform for Image Copyright Security Randi Rizal; Nazwa Auliarahman; Siti Rahayu Selamat; Mae B. Lodana
JICO: International Journal of Informatics and Computing Vol. 1 No. 2 (2025): November 2025
Publisher : IAICO

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This research presents the development of a Discrete Wavelet Transform (DWT)–based method designed to strengthen digital copyright protection in images. The proposed approach leverages multi-resolution decomposition to embed copyright information within high-frequency and mid-frequency sub-bands, enabling improved resistance against common image attacks such as compression, noise addition, and geometric manipulation. Experimental evaluation shows that the method maintains high imperceptibility, with minimal impact on visual quality, while achieving strong extraction accuracy under various distortion scenarios. The results confirm that DWT remains a reliable foundation for constructing secure and robust watermarking mechanisms suitable for modern digital content protection needs.
Co-Authors Alam Rahmatulloh Annisa Putri Wahyuni Arif Bramantoro Gunawan, Rohmat Haerani, Erna Irfan Darmawan Mae B. Lodana Nazwa Auliarahman Rohmat Gunawan Setiawan, Perdi Siti Rahayu Selamat Souhayla Elmeftahi Visi Tinta Manik