https://www.apple.com/business/site/docs/iOS_Security_Guide.pdfAirDrop security
iOS devices that support AirDrop use Bluetooth Low Energy (BLE)
and Apple-created peer-to-peer Wi-Fi technology to send files and information to nearby devices, including AirDrop-capable Mac computers running OS X 10.11 or later. The Wi-Fi radio is used to communicate directly between devices without using any Internet connection or Wi-Fi Access Point.
When a user enables AirDrop, a 2048-bit RSA identity is stored on the device. Additionally, an AirDrop identity hash is created based on the email addresses and phone numbers associated with the user ’ s Apple ID.
这个里面介绍了一些