wiki_lorawan_main.md

 # LoRaWAN Main Wiki Page
 
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-
 ## Security
 
 ### Over-the-Air-Activation (OTAA)
@@ -10,11 +8,15 @@ OTAA-Methodebased on Over-the-Air-Messages for Join Requests and Join Accepts.
 For each end device you need
 * 64-Bit-DevEUI [UUID global / like a MAC]
 * 64-Bit-AppEUI [crypto sign to join network]
-* 128-Bit-AppKey 
+* 128-Bit Application Session Key (AppSKey)
+* 128-Bit Network Session Key (NwkSKey) 
 * 2byte aka 16bit DevNonce [random byte to prevend relplay attack] 
 * Workflow
 ![LoRaWAN-Security](/uploads/b576dc2e6370982ceb3349e9a12f56da/LoRaWAN-Security.png)
 * use this key with AppKey to generate a 4-Byte MIC (Message Integrity Code) 
 * Server accpet only devices with known DevEUI- und AppEUI and check MIC with AppKey.
 ![DevAddr-FCnt-Payload-MIC](/uploads/7904b8481871ef6a2874d2611bbd0817/DevAddr-FCnt-Payload-MIC.png)
-* 
\ No newline at end of file
+
+### Activation by Personalization (ABP)
+the ABP-Method diff from OTAA, as DevAddr and Session Keys (NwkSKey und AppSKey) will be sent.
+For ABP Network need to know already all key. (preshared or OTAA before)