<![CDATA[The ease of modifying digital documents increases the risk of legal data forgery due to the lack of a dual authentication mechanism. This study aims to implement a document validity verification system using the Elliptic Curve Digital Signature Algorithm (ECDSA) integrated into a Quick Response (QR) Code. The system is built on a client-server architecture, where cryptographic computation and public key storage are managed centrally on an application programming interface (API), while the Android application serves as an optical scanner. The validation process applies a dual verification mechanism, namely mathematical verification on the server side and visual verification of the original PDF document. Test results show that the system is capable of completely rejecting data manipulation attempts. The computation time for digital signing remains constant under 1 ms, while the hashing time ranges from 2 ms to 54 ms for document sizes between 500 KB and 5 MB. This system effectively guarantees the integrity and validity of digital documents.]]>
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