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      "abstract": "Perkembangan teknologi mendorong peningkatan penggunaan dokumen\r\nelektronik seperti PDF untuk keperluan administrasi. Namun, dokumen digital\r\nrentan terhadap manipulasi oleh pihak yang tidak berwenang. Penelitian ini\r\nbertujuan untuk membangun sistem autentikasi dokumen digital berbasis web\r\nbernama \"AuthentiC\" menggunakan kombinasi algoritma Elliptic Curve Digital\r\nSignature Algorithm (ECDSA) dan Quick Response Code (QR Code).\r\nSistem ini dikembangkan menggunakan bahasa pemrograman Python\r\ndengan framework Flask, serta pustaka PyMuPDF untuk pemrosesan dokumen.\r\nProses penandatanganan dilakukan dengan melakukan hashing dokumen\r\nmenggunakan SHA-256, enkripsi nilai hash menggunakan private key untuk\r\nmenghasilkan tanda tangan digital (r, s), dan pengodean informasi tersebut ke dalam\r\nformat JSON-Base64 sebelum disematkan sebagai QR Code pada dokumen PDF.\r\nVerifikasi dilakukan dengan memindai QR Code melalui perangkat mobile\r\natau mengunggah kembali file ke sistem web. Pengujian fungsional dengan BlackBox\r\nTesting menunjukkan seluruh fitur berjalan sesuai rancangan. Hasil uji\r\nintegritas membuktikan sistem mampu mendeteksi manipulasi teks atau struktur\r\nfile secara instan melalui perubahan nilai hash. Penelitian ini berhasil membuktikan\r\nbahwa integrasi ECDSA dan QR Code memberikan solusi autentikasi dokumen\r\nPDF yang praktis, aman, dan efisien secara waktu dan komputasi.",
      "date": "2026-06-22",
      "status_changed": "2026-09-17 02:22:53",
      "subjects": [
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      "title": "PENERAPAN TANDA TANGAN DIGITAL BERBASIS ECDSA\r\nYANG DISEMATKAN DALAM QR CODE UNTUK\r\nAUTENTIKASI DOKUMEN DIGITAL",
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