IMPLEMENTATION OF QR CODE AND ADVANCED ENCRYPTION STANDARD (AES) ALGORITHM IN LETTER VALIDATION

Abstract

The process of ratifying letters at the Faculty of Engineering uses manual signatures, even though letter creation is supported by a computerized system. This manual method has weaknesses in terms of security and is prone to counterfeiting. This research aims to overcome this problem by implementing QR Code technology and the Advanced Encryption Standard (AES) 256-bit encryption algorithm which maintains aspects of confidentiality, integrity and availability according to CIA principles in letter authentication. QR Code is used to store information related to letters, while the AES algorithm encrypts the letter ID in the QR Code scanned URL. The method used is Enhanced Re-Engineering, which includes the stages of system analysis, restructuring of system requirements specifications, design to code, and system evaluation. This methodology is then applied through the Extreme Programming (XP) system development stages, which include planning, design, coding and testing stages. As a result, the application of QR Code and AES has been proven to increase security and be effective in authenticating letters, reducing the risk of forgery, and speeding up document verification.