Web-based document certification system with advanced encryption standard digital signature

<span>Web-based degree document certification system with a digital signature in Semarang University has purpose to support academic do online through system. The main problem which occurs administration is long process that causes an ineffective and inefficient process. To solve the problem, can encrypt for better security required. This built advanced encryption standard algorithm 128-bit sized key confidential information inside document. During process, this operates using 4x4 bit array blocks passing many processes at least 10 (ten) times. application analyzed object-oriented analysis modeled Unified modeling language. result of research secure AES 256-bit key. element will make easier identify owner secured easily accessible PHP-based web or available QR code. When decrypting document, activate camera function decrypt document.</span>