在過去的租賃流程，大部份以人工完成。而自從網路普及後，加上POS(Point of Sales)系統的出現，租賃系統中的金流控管效率大幅提升。以往加密的對象大部份為金流資訊，這次我們所要加密的對象為租賃商品的資訊。我們將加密技術應用於租賃系統，配合RS-232通訊裝置從智慧卡及EM讀取裝置取得資料，經過系統處理流程及加密處理後，與伺服器互相傳遞資訊。
本論文將以高雄市腳踏車C-Bike租賃系統為例，針對網路封包、通訊加密以及即時監控做探討，並介紹租賃系統中的重要功能與機制，以及討論我們所遭遇到的問題。系統以TCP/IP傳送網路封包，而送出的資料以先進加密標準(Advanced Encryption Standard)作加解密，並以多執行緒配合資料庫監控租賃站腳踏車。

Most process of lease is done manually in the past. Since the networks were used extensively and systems of Point of Sales risen quickly, the efficiency of administration of payment flow had been obviously promoted. What are mostly encrypted are information of payment flow, but what we encrypt is the information of leased products this time. We apply encryption technique to the lease system, and access information via RS-232 devices, such as SmartCard Reader and EM Reader. After processing of system and encryption, the system will transfer the processed data to the server.
In this paper, we take Kaohsiung C-Bike Lease System for case study, our discussion will focus on network packet, data encryption, and real-time monitoring. We will also introduce critical features and mechanisms of the lease system and address some issues we encountered. This system encrypts data via Advanced Encryption Standard, sends out data packets via TCP/IP, and monitors leased bikes via databases and framework of multi-thread.

摘要 i
Abstract ii
目錄 iii
圖表目錄 v

第一章 簡介 1
1.1 動機 1
1.2 論文架構 2
第二章 文獻探討 3
2.1 TCP/IP 3
2.2 先進加密標準 4
2.2.1 AES的演進 5
2.2.2 數學背景 8
2.2.3 Rijndael加密演算法 10
2.2.4 Rijndael金鑰擴展程序 16
2.2.5 Rijndael解密演算法 17
2.2.6 Rijndael等價解密演算法 22
2.3 Multi Thread 24
第三章 系統實作 28
3.1 系統架構 28
3.2 AES交換Key機制 30
3.3 封包格式 32
3.4 加密流程 33
3.5 借還車通訊機制 35
3.6 參數及車籍資料下載機制 36
第四章 實作結果 37
4.1軟體功能 37
4.2軟體畫面 38
4.2.1即時監控 38
4.2.2卡片交易 40
4.2.3計費設定 41
4.2.4參數及優惠設定 42
第五章 結論與未來展望 45
參考文獻 46

[1]W. Richard Stevens, TCP/IP Illustrated, Volume1.

[2]NIST, Data Encryption Standard, FIPS PUB 46-3, October 25, 1999.

[3]Joan Daemen and Vincent Rijnmen, AES Proposal: Rijndael, AES Algorithm Submission, September 3, 1999.

[4]National Institute of Standards and Technology, Advanced Encryption Standard (AES), Federal Information Processing Standard (FIPS) Publication 197, November 2001.

[5]MSDN home page, URL: http://msdn.microsoft.com/.

[6]Delphi Ktop home page, URL: http://delphi.ktop.com.tw/.

[7]Multi-Threading(Computer hardware) ,URL: http://en.wikipedia.org/

[8]Li-Chung Tung, Design and Implementation of an Asynchronous AES Encryption/Decryption Chip, Dept. of Computer Science and Engineering, National Dong Hwa Unerversity, July 2002.

[9]Ying-Chang Tzeng, The Design and Verification of AES plus CBC Mode Encryption/Decryption IP, Dept. of Electronic Engineering, National Taiwan University of Science and Technology, July 2004.