臺灣博碩士論文加值系統

隨著網路技術的迅速發展，網路成為可以傳輸任何資訊和溝通的媒介，在透過這些媒介進行資料傳輸的過程中，許多具有重要內容的訊息可能會被有心人士擷取，所以在資料儲存、傳輸中，資訊安全成為重要的議題之一。探討資訊安全最主要的目的，就是如何去避免像是信用卡帳號密碼等個人的資訊，在透過網路進行溝通時被攻擊、竊取。影像藏密演算法，可以將重要的訊息藏匿在媒體當中，是一種可以實踐資訊安全內涵的資訊影藏技術。在此篇論文當中，使用微晶片影像、希爾加密法，以及最低有效位元替換來實作影像藏密演算法。因為微晶片影像特性，我們實作四個位元的最低有效位元替換來藏匿秘密訊息。此外，我們所提出的方法不會受到秘密訊息檔案格式的限制。

With the rapid development of technology, Internet has become possible to communicate and transmit any type of data across networks. Security of data or information has become a critical issue in data storage and transmission to prevent attacks from accessing personal information and other types of data such as credit card numbers. Steganography refers to the technique of hiding information in digital media in order to conceal the existence of the information. In this thesis, we use microarray image, Hill cipher algorithm and least significant bits substitution to implement steganography. Because of the advantage of the microarray images, we can perform the four bits LSB replacement method easily to embed the secret message. Moreover, our proposed system is not limited to files format of secret message.

Chapter 1 Introduction 1
Chapter 2 Background Review 4
2.1 Microarray Image Templates 4
2.2 Hill Cipher 6
2.2.1 Hill Matrix 6
2.2.2 Encryption and Decryption 7
2.3 Least Significant Bit (LSB) Algorithm 8
2.4 Other Related Works 9
Chapter 3 Proposed Data Hiding Method 10
3.1 Motivation 11
3.2 Proposed Method 11
3.2.1 Embedding Algorithm 11
3.2.2 Extracting Algorithm 14
Chapter 4 Experimental Results 15
4.1 Cover Images Selected 15
4.2 The Difference of Two Images 16
4.3 Experimental Results 17
4.4 Discussion 19
Chapter 5 Conclusion and Future Work 20
Appendix 21
References 24

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