運用於Web Mail的中文語意藏密系統之設計與實作

Design and Implementation of Linguistic Steganography for Chinese Text on Web Mail

楊佳穎(Chia-Yin Yang)

指導教授 ： 李肇林

國立臺灣大學/電機資訊學院/資訊工程學研究所/碩士(2008年)

https://doi.org/10.6342/NTU.2008.01237

摘要

電子郵件是現代人溝通不可獲缺之媒介，透過電子郵件可以在保有隱私的狀況下，達到快速溝通的效果。然而，在網路世界是充滿不安全的因子，要確實達到保有隱私的效果，必需對電子郵件進行加密，保護其內容。目前常見的加密機制是採用數位簽章及公開金鑰加密等方式，在使用上均較為複雜，對於一般網路使用者較難上手。而且目前各大入口網站均有提供免費的Web Mail服務，以Web Mail收發電子郵件比例很高，但大部份仍以明文方式傳送電子郵件，本文提出一個適用於Web Mail上較簡單容易操作的系統，利用藏密(Steganography)的概念，針對電子郵件中文文字內容作轉換，成為一個意義不同的文章，再寄送出去，當收信人使用解密功能，即可將密文恢復為明文，達到傳送過程中的保護效果。

關鍵字

電子郵件 ； 資訊隱藏 ； 藏密 ； 加密 ； 網頁郵件

並列摘要

E-mail is an indispensable modern communication of the media. Via e-mail, privacy can be maintain in the circumstances and achieve rapid communication of results.
However, it is full of insecurity factors in the Internet world. In order to achieve privacy protection, e-mail content must be encrypted. The present common encryption mechanism is digital signatures and public key encryption. Both in the use of more complex and more difficult for the average Internet users get started. And the major portals are now providing free Web Mail services. But most e-mail delivery is still sent with plain text.
In this study, a user-friendly system for the Web Mail is provided. The system includes the steganography concept which converses the Chinese texts in the e-mail into entirely different texts. The receiver can still read the letter by using the decryption functions, so that the emails can be restored to the plain text. Meanwhile, the email is well-protected during the delivery process.

並列關鍵字

Chinese word segmentation ； Web Mail ； E-mail ； information hiding ； steganography

參考文獻

[1] MMSEG: A Word Identification System for Mandarin Chinese Text Based on Two Variants of the Maximum Matching Algorithm by Chih-Hao Tsai , April 1999

[3] Internet Explorer Architecture :

[4] About the Browser:

[5] Adding Entries to the Standard Context Menu

[8] Google Desktop APIs