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  • 學位論文

植基於除法運算之資料隱藏

Data Hiding Base on Division Arithmetic

指導教授 : 莊振村
共同指導教授 : 郭文中(Wen-Chung Kuo)
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摘要


本篇論文中,我們提出了簡單且容易實作的新型資料隱藏方法(簡稱DA)。傳統的最低有效位元取代法(簡稱LSB取代法)係因直接對隱蔽媒體中最不重要之位元以秘密訊息取代之,在隱寫術的攻擊分析下明顯不夠安全。本論文方法使用除法運算,產生一個商數區塊決定嵌入位置之後,結合LSB取代法以及利用修改方向法(簡稱EMD),解決了LSB直接以秘密取代像素位元之安全疑慮,也提高了隱蔽媒體可嵌入的資料量。本論文方法不僅保有原來LSB取代方法的優點,在隱藏學分析方面更加強了其安全性。實驗結果顯示,我們所提出的方法在掩蔽媒體嵌入秘密訊息之後仍有良好的PSNR值和高嵌入容量。即使遭受到位元平面攻擊,我們的方法仍然可以維持隱藏訊息的保密性。

並列摘要


In this thesis, we present novel steganographic methods. These methods are simple and easy to implement. Importantly, they are more secure than traditional least significant bit (LSB) replacement technique. In other words, these methods firstly generate a quotient block using the division arithmetic (the DA algorithm) to decide the embedding position, and then combine the least significant bit replacement technique and exploiting modification direction method (also called EMD) to raise the payload of cover media. According to our analysis, the proposed methods not only keep the advantages of LSB replacement technique, but also enhance the security on steganalysis. The experiment results show that the proposed methods have good peak signal-to-noise ratio (PSNR) and data embedding capacity. Even under the bit-plane attack, our approaches still can ensure the confidentiality of hiding secrets.

並列關鍵字

Steganography Steganalysis Division Algorithm LSB EMD

參考文獻


[3] J. Reeds, “Solved: The ciphers in book III of Trithemius’ steganographia,”
[4] Gustavus J. Simmons, “The prisoners’ problem and the subliminal channel,”
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survey,” Proc. IEEE, vol. 87, pp. 1062-1078, 1999.
[6] Chi-Kwong Chan, L.M. Cheng, “Hiding data in images by simple LSB

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