The device key is derived from the ECDHSecret and ProvisioningSalt.

[UnitedBus]

hello support

I am reading the Mesh Spec and came across

The device key is derived from the ECDHSecret and ProvisioningSalt.

Whats meant by  ProvisioningSalt.

[tesc]

Hi,

The ProvisioningSalt is a value that is calculated based on other values involved in the provisioning process, all of which are defined throughout chapter 5.

I find it a bit strange that there is no reference to it from where you found that line (beginning of chapter 5), but there is a reference at the end of section 3.8.6.1:

"The ProvisioningSalt is defined in Section 5.4.2.5 and the ECDHSecret is defined in Section 5.4.2.3".

From Section 5.4.2.5:
"ProvisioningSalt = s1(ConfirmationSalt || RandomProvisioner || RandomDevice)"

ConfirmationSalt, RandomProvisioner and RandomDevice are all defined in Section 5.4.2.4.

Regards,
Terje