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WPA/WPA2 : A real security for WiFi ?
Access to the content
Beginning of the presentation
PDF version
[1530 KB]
Adobe Flash version
Description
This presentation explains 802.11i standard and WPA / WPA2 implementation : new cipher protocol (TKIP and CCMP), generation and key hierarchy, etc.
Context & Dates
Talk presented during OSSIR meating, on 14 June 2005.
Author
Guillaume Lehembre (Guillaume.Lehembre@hsc.fr)
Type
[
-
]
Abstract &
Table of content
Flyleaf
Plan
Principe 1/2
Principe 2/2
Eléments d'architecture
MPDU / MSDU
Association / Authentification
Trame 802.11
WEP
Vulnerabilites
Attaque statistique
Cassage WEP 1/2
Cassage WEP 2/2
Composants 802.1x
Port 802.1x
Architecture 802.1x
EAPoL & Radius
Généralités EAP
EAP
Pourquoi 802.11i ?
WPA 1/2
WPA 2/2
WPA2 1/2
WPA2 2/2
802.11i - Phases Opérationnelles
802.11i - Négotiation politique
802.11 - Authentification 802.1x
802.11i - Echange de clef
Clef PTK 1/2
Clef PTK 2/2
Decomposition des Pairwise Keys
4-Way Handshake 1/2
4-Way Handshake 2/2
Clef GTK
Décomposition des Groups Keys
Group Key Handshake
STAKey Handshake
802.11i - Chiffrement
TKIP 1/3
TKIP 2/3
TKIP 3/3
MIC
Validation MSDU TKIP
CCMP 1/3
CCMP 2/3
CCMP 3/3
Validation MSDU CCMP
Récapitulatif chiffrement
Faiblesses ? 1/2
Faiblesses ? 2/2
Itinérance
Conclusion
Références
Questions ?
Rendez-vous
Demonstrations in Flash
Injection de trames ARP pour augmenter la vitesse de cassage des clefs WEP 128
(1,3 MB - 2'53")
Better see it in a 800x600 pixels pop-up
Découverte de la clef WEP 128
(514 KB - 0'55")
Better see it in a 800x600 pixels pop-up
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