Digital signatures are essential for ensuring document authenticity and integrity. However, traditional cryptographic approaches cannot detect sophisticated content modifications that preserve file structure while altering critical information such as financial amounts or beneficiary details. This study presents a comprehensive system combining RSA-2048 digital signatures with advanced OCR techniques and accuracy-based validation mechanisms. Our approach employs RSA cryptography for signature generation while OCR facilitates real-time text extraction with content-aware verification. The system includes multi-layer verification mechanisms that confirm document content remains unchanged through integrated hash verification combining document fingerprints with OCR content analysis. Experimental validation demonstrates effective tamper detection capabilities with comprehensive testing on government documents. Performance evaluation shows 2.3 seconds signing times, 1.8 seconds verification, and 100 % accuracy for critical field extraction on tested government documents. Load testing validation demonstrates production scalability with 3.67 RPS signing throughput and 98.5 % reliability under concurrent access. The framework successfully detected financial amount alterations in real government vouchers, demonstrating practical deployment feasibility and providing an integrated content-aware cryptographic solution with proven scalability for digital document protection.