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研究生:薛揚璋
研究生(外文):Yang-Zhang Xue
論文名稱:可逆型與不可逆型資訊隱藏技術優化之研究
論文名稱(外文):The Study on Improvement of Reversible and Irreversible Information Hiding
指導教授:張薰文張薰文引用關係
指導教授(外文):Hsun-Wen Chang
口試委員:張薰文
口試委員(外文):Hsun-Wen Chang
口試日期:2017-07-26
學位類別:碩士
校院名稱:大同大學
系所名稱:資訊工程學系(所)
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2017
畢業學年度:105
語文別:中文
論文頁數:56
中文關鍵詞:資訊隱藏藏密影像遮蔽影像高峰訊號雜訊比模數函式
外文關鍵詞:steganographycover imagestego imagePSNRmodulo function
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在現今生活中資料在網路上儲存或傳遞已相當普及,因此需要重視資料傳輸的安全性。在密碼學的運用上,將傳遞的訊息加密成雜亂無章的密文,反而容易引起有心人士嘗試窺探其內容;相對地,資訊隱藏則是以不被人察覺的方式,將機密訊息藏入檔案中,進而達到資訊安全上的防護。資訊隱藏可實際應用在智權保護、防偽認證、授權查驗、機密運用、資訊夾帶等領域。
在不可逆型資訊隱藏領域,先前已有許多學者提出以模數函式的技術進行資訊隱藏。本論文同樣也基於以模數函式為基礎,首先提出最優(4, 10)-模數函式藏匿法,達到每像素可藏匿最高2.5位元機密訊息之藏密率,並保證藏匿品質在最低高峰信號雜訊比(PSNRw)的評量中,均高於人類感知差異之門檻值。其次對於欲藏匿之機密訊息量低時,本論文提出最優(n, b)-模數函式藏匿法,提供在n個像素中藏匿b個位元機密訊息時,搭配最優權重係數組,以提供最優之藏匿品質。此外,在藏匿效率方面,我們除了減少溢位之發生,也討論增加效率之方法。
在可逆型的資訊隱藏領域,我們更改判斷流程,提出更簡潔的演算法,並使發生機率高的案例在第一個判斷或是較少的判斷式中,就可以確認該像素值修改方向,提高了2倍以上的執行效率。
Nowadays, data transmission and stored on internet are very popular, so that data security is an important topic. Cryptography encrypts secret messages as chaos-like cipher-texts which will attract attention of malicious attacker. On the other hand, information hiding embeds secret messages into a cover media in which imperceptibility keeps the secret safe. Information hiding can be applied in the field of intellectual protection, security certification, authorization inspection, use of confidential, information entrainment and many other fields.
Among irreversible information-hiding techniques, many researches based on modulo operations have been proposed. Our researches are also base on modulo operations. We first present an optimal (4, 10)-modulo-operation information-hiding technique, which achieve highest 2.5 data hiding bit rates per pixel and good hiding quality on peak signal to noise ratio. On the other hand, we present an optimal (n, b)- modulo-operation information-hiding technique, which provide hiding b bit rates per n pixels with high hiding quality based on optimal weighted coefficients. Moreover, hiding efficiency in our algorithms are also improved.
Among reversible information-hiding techniques, we modify the procedure of judgment and present a concise algorithm so that we make less decision in more frequent cases. Our algorithm can make two times improvement in efficiency.
致謝i
摘要ii
ABSTRACT iii
目錄iv
第一章 緒論1
1.1 簡介1
1.2 資訊隱藏技術的基礎3
1.2.1 術語與架構4
1.2.2效能評估之面向4
第二章 文獻探討8
2.1 不可逆型資訊隱藏相關技術8
2.1.1 利用修改方向之藏匿技術8
2.1.2 區塊差異值隱藏技術I 10
2.1.3 區塊差異值隱藏技術II 12
2.2 可逆型資訊隱藏相關技術14
2.2.1 基於區塊極值之藏匿技術14
2.2.2 效能評估21
第三章 最優模數函式藏匿法26
3.1 最優(4, 10)-模數函式藏匿法26
3.1.1 優化之理論基礎26
3.1.2 機密訊息嵌入與擷取機制27
3.1.3 優化效能評估30
3.2 最優(n, b)-模數函式藏匿法31
3.2.1 由機密訊息量抉擇最佳品質32
3.2.2 最優訊息嵌入率之效能提升34
3.3 實驗結果35
第四章 改良基於區塊極值之藏匿技術38
4.1 改良之理論基礎38
4.2 機密訊息嵌入、擷取與遮蔽影像還原機制39
4.3 改良效能評估45
第五章 結論50
參考文獻 52
附  錄 55
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