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密碼學報告 Wired Equivalent Privacy Algorithm, WEP 有線等效保密演算法

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密碼學報告 Wired Equivalent Privacy Algorithm, WEP 有線等效保密演算法. Present :張永昌 Chang Yung-Chang. Outline. 簡介. 開放系統式認證 (Open System). 共享密匙式認證 (Shared Key). WEP 演算法特色. WEP 運作原理. 簡介. 無線網路的種類 Ad-Hoc LAN Infrastructured wireless LAN. 非法使用者. 簡介. 無線網路在傳輸過程中需要做到 認證 跟 保密. 開放系統式認證 (Open System). - PowerPoint PPT Presentation

Text of 密碼學報告 Wired Equivalent Privacy Algorithm, WEP 有線等效保密演算法

  • Wired Equivalent Privacy Algorithm, WEPPresentChang Yung-Chang

  • (Open System)(Shared Key)WEPWEPOutline

  • Ad-Hoc LANInfrastructured wireless LAN

  • (Open System)MAC

  • (Open System)(a)(b)

    Authentication Algorithm Number=0Authentication Transaction SequenceNumber=1Status Code

    Authentication Algorithm Number=0Authentication Transaction SequenceNumber=2Status Code=

  • (Shared Key) RADIUS (Challenge/Response)

  • (Shared Key)

  • (Shared Key)(a)(b)

  • (Shared Key)(c)(d)

  • WEP

  • WEPEk(P)=CDk(C)=Dk(Ek(P))=P

  • WEPWEP

  • WEPWEPMPDU

  • WEPWEP

  • () () ? ?Identity assertionAuthentication frame13-13(a)SA(Station ID) 13-13(b)(WEPOFF) Identity assertionAuthentication frame13-13(a)SA(Station ID) 13-13(b)(WEPOFF) (Shared Key) ()IEEE 802.11WEP(Authentication frame)13-14(a)(Identity assertion) SA(Station ID)(result)()WEP128(Challenge text) 12-14(b)(WEP=OFF) 13-14(c)(WEP=ON) 13-14(d)(WEP=OFF) (Authentication frame)13-14(a)(Identity assertion) SA(Station ID)(result)()WEP128(Challenge text) 12-14(b)(WEP=OFF) 13-14(c)(WEP=ON) 13-14(d)(WEP=OFF)

    (brute-force)WEP(Initialization Vector, IV) WEP(self-synchronization)(data-link level)WEPWEP() WEP802.11WEP802.11WEP() WEP

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