Digital signature in e-certificate / Muhammad Iqhuan Hariirie Suhaimi

The project implements RSA digital signatures to tackle authenticity and integrity issues with e-certificates at Universiti Teknologi MARA Kuala Terengganu's activity clubs. Users generate and sign e-certificates securely through a Next.js and Firebase- built web-based platform that provides verification capabilities. The system uses RSA digital signatures to ensure e-certificate integrity and authenticity. The system enables automatic e-certificate generation and batch signing and provides secure email distribution through the Resend API in addition to online and PDF-native verification options. Nine participants from the activity club committee with students took part in the evaluation by completing System Usability Scale (SUS) tests which yielded a score of 70.3 showing good usability. Test results from comprehensive functionality evaluation showed that essential system features operated successfully for e-certificate generation and digital signing followed by verification and distribution. Self-signed certificates used for internal university purposes successfully prevent unauthorized changes which protects e-certificates from alteration and confirms their integrity and authenticity. The practical implementation offers a usable approach toward digital credential management in educational institutions while new features can be developed in the future.