Which is best candidate out of nrf52840 & nRF52832 for BluetoothMesh n/w for security point of view ?

[vikrant8051]

> This is highlight of difference
> between #nrf52840 & #nRF52832.
> 
> #nRF52840 has additional feature of ARM CryptoCell. 
> 
> Is this make #nRF52840 more secure for
> #IoT or #BluetoothMesh application where security of network is more
> important ?

[ovrebekk]

Hi

The current implementation of Bluetooth mesh does not use the Cryptocell module, and we have no immediate plans of adding support for it. In other words, there are no changes to Bluetooth mesh security whether or not you use the nRF52840 or the nRF52832.

As you hint at in the comment the nRF52840 is overkill for many mesh applications, and we expect the nRF52832 to be a more popular choice.

We can implement all the security requirements of the Bluetooth mesh specification without it. The main advantage of using the Cryptocell when it's available is that the crypto algorithms run quicker, which can reduce latency and power consumption.
Since the radio is on continuously when using mesh the power consumption is pretty high already, and the improvements by using Cryptocell would most likely be marginal.

Best regards
Torbjørn Øvrebekk