Not sure if this was already dropped

https://motherboard.vice.com/en_us/article/gyakgw/the-prototype-dev-fused-iphones-that-hackers-use-to-research-apple-zero-days

The thing that his team had been able to analyze for the first time was the iPhone’s Secure Enclave Processor (SEP), which handles data encryption for the iPhone. How they were able to do this was a valid question given Apple’s notorious secrecy, and the fact that the SEP is one of the most important and most closely guarded components of the iPhone, the most secure smartphone on the market.