| Summary: | 碩士 === 國立高雄第一科技大學 === 電腦與通訊工程研究所 === 100 === With the advance of technology and popularization of mobile devices, the application of 2-D bar code is more and more general by people, and the QR Code is more common used in every field. But user will get unpredicted loss by decoded fake QR Code at unknowing situation. Besides, the priority of decoding QR Code fail will upgrade because of some special features or the situation that same color module gather together appear on the QR Code. This topic that decoder how to get correct message quickly and correctly, and user how to known the message is correct in QR Code needs to be discussed. To discuss how to hiding secret message in QR Code, this paper proposes two methods by QR Code scoring mechanism as the starting scoring. Firstly, hide secret message in codeword symbol with high penalty scoring module. This method has high hiding capacity, and can reduce the penalty scoring of QR Code probably. Secondly, hide message base on the target that reducing the penalty scoring warranty. This method flips the codeword symbol carefully with high penalty scoring module which propose is deciding the total penalty scoring of QR
Code will go up or not. The QR Code with the embedded secret message by two method in this paper can decode original information if the decoder is general. Decode original information but also decode secret message by the decoder that proposed in this paper. Experiment results show the proposed methods are feasible.
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