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I read now a bit in the specification from here: https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?doc_id=229737 - Volume 3, Part H, Section 3.5.1 Pairing Request and 3.5.2 Pairing Response. IMHO encryption is mandatory after devices have been paired, as the initiator must send a maximum key size to be used: Maximum Encryption Key Size (1 octet) ...


The attack actually works. I've been playing with the Ubertooth One that I acquired at DEF CON five years ago and have tested it against a variety of IoT devices that implement the BLE standard. Mike Ryan's paper is correct. From the book, "Abusing the Internet of Things", the author discusses Mike Ryan's work and the implementation with the Ubertooth One. ...

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