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研究生:邱志豪 
研究生(外文):Ji-Hau Chiu
論文名稱:架構於無線區域網路之密鑰交換與認證機制
論文名稱(外文):An Enhanced Key Exchange and Authentication Scheme for Wireless LANs
指導教授:歐陽彥杰
指導教授(外文):Ouyang, Y.C
學位類別:碩士
校院名稱:國立中興大學
系所名稱:電機工程學系
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:2002
畢業學年度:90
語文別:英文
論文頁數:76
中文關鍵詞:無線安全動態交換密鑰802.11802.1X
外文關鍵詞:Wireless SecurityDynamic Key Exchange802.11802.1X
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最近的研究顯示IEEE 802.11之安全協定WEP (Wired Equivalent Privacy)有相當多的漏洞存在。IEEE 802.1X和IEEE 802.11i所提出的方案能解決其中的一些問題,但802.1X其本身也有安全性的問題,這些存在的缺點將會使得系統易遭受到中間人攻擊,而802.11i目前尚是草稿(draft)的狀態。從這兩個標準可得知無線通訊的安全問題主要是在於密鑰的傳輸與雙方相互的身份認證。為了改善這些問題,提出一簡單且有效率的協定,稱之為Dynamic Key Exchange Protocol (DKEP)。此協定的特性有機密、認證、和能更新共享秘密的機制,而且還能抵禦中間人攻擊和重送攻擊。除此之外,我們更提出一個修正的協定,主要是更正在802.1X的環境下無法相互認證的缺點,利用RADIUS伺服器來達到所要的目的。

WEP (Wired Equivalent Privacy) is part of the 802.11 standard, and recent studies show many flaws discovered. The 802.1X and 802.11i were proposed to resolve some problems in 802.11. However, the 802.1X still has some drawbacks and could be hijacked through middle of communication session, and the 802.11i is draft now. The main problems in the wireless security standards are key distribution and mutual authentication between the supplicant and the AP (access point). In order to correct the drawbacks of these problems, we provide a simple and efficient protocol called Dynamic Key Exchange Protocol (DKEP). This protocol can provide confidentiality, authentication, and mechanism to refresh shared secret materials. Moreover, DKEP can also defend the Man-In-The-Middle attack and replay attack. We also proposed an enhanced protocol for 802.1X that takes advantage by using a RADIUS server mean while can easily archive the goal of mutual authentication within the supplicant and the AP.

1. Introduction
2. Encryption/Decryption
3. Wireless Securiry
4. Dynamic Key Exchange Protocol
5. Conclusion ans Future works

[1] A. Mishra and W. A. Arbaugh, “An Initial Security Analysis of the IEEE 802.1X Standard,” Department of Computer Science University of Maryland, Feb 6, 2002, CS-TR-43228.
[2] B. Aboba, “PPP EAP-TLS Authentication Protocol,” IEFT RFC 2716.
[3] B. Schneier, “Applied Cryptography 2rd,” John Wiley & Sons, 1996.
[4] C. Rigney, “Remote authentication dial In Supplicant Service (RADIUS),” IEFT RFC 2865.
[5] Federal Information Processing Standards Publications (FIPS PUBS), “Announcing the ADVANCED ENCRYPTION STANDARD (AES),” Federal Information Processing Standards Publication 197, November 26, 2001.
[6] G. Meredith, “Securing The Wireless LAN,” CISCO SYSTEMS SUPPLICANTS MAGAZINE, Third Quarter 2001.
[7] IEEE, “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specification:Specification for Enhanced Security,” IEEE Standard 802.11i/D1.8, January 2002.
[8] IEEE, “IEEE Standard for Local and metropolitan area networks - Port-based Networks Access Control,” IEEE Standard 802.1X, 2001.
[9] IEEE, “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specification,” IEEE Standard 802.11, 1997.
[10] K. Kaukonen and R. Thayer, “A Stream Cipher Encryption Algorithm Arcfour,” http://www.mozilla.org/projects/security/pki/nss/draft-kaukonen-cipher-arcfour-03.txt.
[11] N. Borison,I. Goldberg and D. Wagner, “Intercepting Mobile Communications:The Insecurity of 802.11,” http://www.isaac.cs.berkeley.edu/isaac/wep-draft.pdf.
[12] N. Haller and C. Metz, “A One-time password System,” IEFT RFC 1938.
[13] P. Rogaway, M. Bellare, T. Black, and T. Krovetz, “OCB:A Block-Cipher Mode of Operation for Efficient Authenticated Encryption,” Auguest 16, 2001, http://csrc.nist.gov/encryption/modes/proposedmodes/ocb/ocb-spec.pdf.
[14] S. Weatherspoon, “Overview of 802.11b Security,” Network Communications Group, Intel Corporation, http://www.intel.com/technology/itj/q22000/article/art
_5.htm.

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