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new file mode 100644
index 0000000..981fca2
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diff --git a/content/securite/3_les-reseaux-wifi/index.md b/content/securite/3_les-reseaux-wifi/index.md
new file mode 100644
index 0000000..b97dcf3
--- /dev/null
+++ b/content/securite/3_les-reseaux-wifi/index.md
@@ -0,0 +1,77 @@
+---
+title: "Les réseaux Wifi"
+date: 2019-02-07
+categories: ['Sécurité', 'cours']
+tags : ['trame', 'aircrack', 'wifi']
+---
+
+Le Wifi est un ensemble de **protocoles de communication sans fils** issus de la
+norme 802.11. Il correspond aux couches 1 et 2 (physique et liaison) du modèle
+OSI. Son fonctionnement se veut similaire  au protocole Ethernet.  Au niveau
+physique, les communications se basent sur les ondes électromagnétiques sur
+2,4Ghz ou 5Ghz.
+
+On distinguera plusieurs mode de fonctionnement : 
+
+ - **infrastructure** :  nous avons un ou plusieurs points d'accès faisant
+     office de switch et des clients.
+ - **ad hoc** : plusieurs clients se connectent entre eux pour, par exemple
+     échanger des fichiers ou partager des ressources (imprimantes ...)
+ - **pont** : deux points d'accès inter-connectés pour étendre un réseau filaire
+ - **répéteur** : deux ou plusieurs points d'accès sont inter-connectés pour
+     étendre la portée du réseau. Dans ce mode les connexion Ethernet des
+     points d'accès restent inactifs (sauf sur le premier AP)
+
+De par la nature du média, une carte d'accès à un réseau wifi écoute toutes les
+communications dans sa zone d'action et ce sans être présente sur les réseaux
+disponibles. Mais le système d'exploitation cache tous les paquets qui ne sont
+pas destinés explicitement à notre machine.
+
+Il est cependant possible de passe la carte en mode *promiscuous* afin d'obtenir
+l'ensemble des trames disponible.
+
+## Les points d'accès
+
+Un points d'accès rend disponible un réseau wifi. Voici les éléments qui
+définissent un réseau wifi basé sur un point d'accès.
+
+ - Le **BSSID** : l'adresse MAC du point d'accès
+ - Le **BSS** : pour *Basis Service Set* représente le points d'accès et ses 
+     clients
+ - Le **ESS**: pour *Extended Service Set* est un ensemble de BSS cohérents 
+     regroupés sous un même ESSID, par exemple le réseau wifi *eduroam*
+ - Le **ESSID** : abrégé SSID pour *Extended Service Set IDentifier*
+ 
+Lorsque un point d'accès est en fonctionnement, il envoie à intervalle régulier
+une trame *beacon* pour annoncer sa présence. Ces trames donnent son BSSID, ses 
+caractéristiques et éventuellement son *ESSID*.
+
+### analyse d'une trame Wifi
+
+Voici le schéma de fonctionnement d'une trame Wifi 
+
+![img](./images/schema_trame_w.svg)
+
+Voici le détail : 
+
+ - **Frame Control** : donne des informations sur le type de trame, ce segment
+     est divisé en plusieurs sous champs. Il y a trois type de trame :
+      - *Gestion* : utilisées pour les associations, désassociations,
+          authentifications etc.
+      - *Contrôle* : pour ce qui touche aux contrôles des transmissions comme
+          les *ACK*
+      - * *Data* : pour la transmission de données
+ - **AID / duration** : en  fonction du type de trame, ce champs
+     peut avoir des fonction différentes
+ - **Adresses 1,2,3,4** : dans le cas d'un réseau Wifi, deux adresses ne
+     suffisent pas pour déterminer le chemin d'une trame. Il est donc possible
+     de stocker jusqu'à 4 adresses de type MAC (6 octets) Voici les 4 adresses
+     possibles : 
+     - *SA* : adresse source, ce peut être une adresse sur un réseau filaire ou
+         d'un AP wifi.
+     - *DA* : adresse de destination peut être sur un réseau sans fil ou filaire
+     - *TA* : adresse de la station ayant mis la trame sur le réseau wifi
+     - *RA* : adresse du périphérique wifi ayant reçu la trame sur le réseau
+         wifi
+ - **Sequence Control** : numéro de séquence dans le cas de trames fragmentées.
+ - **FCS** : somme de contrôle de la trame sur 32 bits