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

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).

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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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  1. 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

  2. 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

  3. 簡介 • 無線網路的種類 • Ad-Hoc LAN • Infrastructured wireless LAN

  4. 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

  5. 開放系統式認證(Open System) • 由『MAC 位址』認證 • 擷取器或其他工作站負責

  6. 開放系統式認證(Open System) (a)要求認證訊框 (b)回覆認證訊框

  7. 共享密匙式認證(Shared Key) • 共享密匙 • 如 RADIUS 管理分配 • 盤問與回應(Challenge/Response) • 詢問雙方鑰匙是否相同

  8. 共享密匙式認證(Shared Key)

  9. 共享密匙式認證(Shared Key) (a)要求認證訊框 (b)回覆認證訊框

  10. 共享密匙式認證(Shared Key) (d)再回覆認證訊框 (c)再要求認證訊框

  11. WEP演算法特色 • 抗竊聽性強 • 具有自我同步能力 • 效率高 • 出口性爭議 • 選項功能

  12. WEP運作原理 • 加密函式：Ek(P)=C • 解密函式：Dk(C)=Dk(Ek(P))=P 原文加密及解密基本過程

  13. WEP運作原理 WEP演算法加密過程

  14. WEP運作原理 經WEP處理過的MPDU架構

  15. WEP運作原理 WEP演算法解密過程

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