identity root and encryption root

RE: identity root and encryption root

Ulrich Myhre — Fri, 01 Sep 2017 08:25:03 GMT

To my knowledge, they should all be completely random. DEVICEADDR will have two bits set according to the Bluetooth address standard. For chip identification, you generally want to use DEVICEID[0-1], but IR/ER can be used as differentiators for other things.

RE: identity root and encryption root

capricorn — Fri, 01 Sep 2017 02:17:17 GMT

@Ulrich Myhre. can you tell me which is more probably unique among IR, ER, DEVICEID and DEVICEADDR. or we say whose matching probability is less in among chips released.

RE: identity root and encryption root

Jean-Louis Bonnaffé — Thu, 13 Aug 2015 07:35:11 GMT

Thank you, that's very clear.

RE: identity root and encryption root

Ulrich Myhre — Wed, 12 Aug 2015 18:28:46 GMT

The IR and ER fields are random values used to generate some of the device information and keys used by the SoftDevice for BLE. These are not very useful for the common user, but could be used as a static identifier for a specific chip.