iot 架构
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- perception layer (sensors, actuators)
- network layer(nodes, gateways, firmware)
- middleware layer(vendor specific third application, machine learning, real time action)
- application layer(third party application, consoles, websites, business model)

attack to different layer: ...

network layer attack: 
- device cloning
- spoofing
- eavesdropping
- key attack(hard code key)
- brute-force
- traffic analysis
- MITM
- sinkhole

perception layer key distribution:
- broadcast key 
- group key
- master key pre-distribution
- pairwise key

doc
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- `Trusted IoT Device Network-Layer Onboarding and Lifecycle Management <https://www.nccoe.nist.gov/projects/trusted-iot-device-network-layer-onboarding-and-lifecycle-management>`_