Developing Web-Based Application for QR Code Digital Signatures using OpenSSL

Despite advancements in technology, many work-related activities still require signature verification. Digital signature technology offers a suitable solution that can be implemented through information technology. This research presents the development of a digital signature application utilizing hash functions using SHA-256 to generate digital signature tokens while OpenSSL is used to create valid digital signatures that start with generating a key pair. The application features automatic conversion of the generated tokens into QR codes, simplifying the verification process. It is developed using custom core system classes within the CodeIgniter framework. The implementation of these custom core system classes has yielded positive results. This application is designed to facilitate the secure and efficient authorization of document signing. Testing revealed that digital signature generation took under 0.0210 seconds, while file uploads varied from 0.0655 to 0.0851 seconds for file sizes ranging from 100 KB to 1000 KB. Additionally, user authentication testing ensured prompt delivery of OTPs via email and robust resistance to Man-in-the-Middle attacks, demonstrating secure transmission of login data over HTTPS. The analysis affirmed signature integrity, authenticity, and QR code verification efficiency, ensuring secure and efficient document signing authorization.