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# LoRaWAN Main Wiki Page
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## Security
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### Over-the-Air-Activation (OTAA)
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OTAA-Methodebased on Over-the-Air-Messages for Join Requests and Join Accepts.
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For each end device you need
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* 64-Bit-DevEUI [UUID global / like a MAC]
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* 64-Bit-AppEUI [crypto sign to join network]
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* 128-Bit-AppKey
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* 2byte aka 16bit DevNonce [random byte to prevend relplay attack]
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* Workflow
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![LoRaWAN-Security](/uploads/b576dc2e6370982ceb3349e9a12f56da/LoRaWAN-Security.png) |
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