Implementasi Digital Signature dengan Algoritma Rabin-p dan SHA-256 untuk File PDF pada Aplikasi Android

Abstract

In the rapidly evolving digital era, the importance of information security and authenticity becomes increasingly evident. One effective approach to address these concerns is through the use of digital signatures. The main objective of this research is to develop an Android application with the capability to perform digital signature processes on PDF files. This process involves the use of the Rabin-p algorithm to create digital signatures and the SHA-256 algorithm to generate hashes from documents. The application also places special emphasis on security by securely storing the user's private keys, ensuring that the generated digital signatures remain protected from potential external threats. The research methodology encompasses the stages of designing and implementing the Rabin-p and SHA-256 algorithms within the context of an Android application, integrated with existing PDF viewers. Testing is conducted to evaluate the effectiveness of digital signatures in verifying the integrity and authenticity of PDF files. The test results confirm the application's ability to produce valid digital signatures and identify changes in PDF files.