Reading your post and I had come up with something similar a few years back. Adding my notes below but I dont have the skills to put it together. Kind of wish there was a commercially available system with the same security measures.
There is a huge demand for devices like this in some places. I dont condone it but in South Korea these are very often used in womens bathrooms (so much so that in Seoul, there are teams that check the bathrooms daily).
This would also be good for deployment as a trail cam or security cam. In any role I can see a benefit in separating the device from the owner. If found even a thorough forensic analysis should not provide any useful information that would aid in identifying whomever placed it.
Hardware:
- Raspberry Pi or Arduino
- Camera module
- Cellular data module
- IR motion sensor (or software based?)
- Tamper-resistant self-destruct module (simple, voltage/current driven, massive power surge)
- Power source and backup battery
- Enclosure
Software:
- Base OS
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