It's unknown how the StreetPass CCMP data-encryption key is generated, [[NWM_Services|NWM]] module handles this CCMP key.
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The StreetPass local-WLAN CCMP data-encryption key is generated via [[NWM_Services|NWM]] module, the input "passphrase" used here is generated by the StreetPass CECD module using [[PS:EncryptDecryptAes]] with keytype6.