Compatible 2D-Code Having Tamper Detection System with QR-Code

摘要

The matrix barcodes known as Quick Response (QR) codes, which are enable us to import printed digital information into smart-phone or cell phone through its digital camera easily, are rapidly becoming widespread not only Japan but also Asia, Europe and America. However, an attacker is easily able to lead malicious web-sites by putting a unauthenticated QR code on a authenticated QR code. We propose a compatible 2d-code having tamper detection system with QR-code. In digital signature system, a hash value of a message is calculated firstly, and then the hash value is encrypted by a secret key which is a pair of public key cryptography system. Then, a sender sends the message and the encrypted hash value to a receiver. In the receiver side, the hash value of a sent message is calculated and the hash value with encrypted is decrypted using a public key which is a pair of public key cryptography system. The receiver can detect modification of the message by comparing the two hash values. The encrypted hash value is embedded by using Wet Paper code within cells of QR-codes. In this paper, we report the robustness of reading cells of QR code which plays an important role in our code and the state of the progress for the implementation of the proposed system.