Analysis and Implementation of Digital Signature Algorithm in PDF Document

A digital signature is a cryptographic tool used to sign and verify messages to provide authentication, integrity, and non-repudiation of an electronic document. Digital signatures have been widely used in commercial systems, especially since the Corona Virus Disease 2019 (COVID-19) pandemic forced many people to do work from home, so they had to send documents between people digitally. Many digital signature algorithms have been proposed before, however, the most suitable algorithm for Portable Document Format (PDF) documents from the point of view of security and digital signature processing time are unknown. Apart from this, the available digital signature service systems are relatively expensive. To overcome this, this study proposes an analysis of digital signature algorithms in terms of security, memory usage, and processing time on PDF documents. This study also proposes the development of prototype web service digital signatures that use the best digital signature algorithms that have been analyzed as proof of concept as a result of the analysis made by this study. The methods used in this study are study of the literature on digital signature algorithms, Analysis of digital signature algorithms, Development of prototypes, Performance testing, and analysis. The outcome of this research is that ECDSA is an algorithm that can sign PDF documents with good processing time and memory usage. This research succeeded in creating a digital signature web using the ECDSA algorithm which can perform digital signatures on PDF documents and verify digital signatures on PDF documents.