Paperless — Digital Signature Platform

Overview

Built the backend for a PSrE-compliant digital signature platform using OpenSSL cryptography and Public Key Infrastructure (PKI). Implemented Long-Term Validation (LTV) and Timestamp Authority (TSA) integration.

Paperless is a legally-binding electronic document signing platform matching Indonesia's national electronic certification authority (PSrE) standards. The system handles secure PDF signing using X.509 certificates, integrates with TSA servers to seal signature timing, and supports LTV to maintain validity even when the signing certificate expires.