RE: Unable to Decrypt the Friendship Packets between Low Power Node and Friend Node

Chandu_Maharaj — Wed, 24 Mar 2021 04:13:20 GMT

Thanks Hung,

I have gone through the specification, the security credentials are different for both Mesh Network and Friendship Network.

The master security material is derived from the master security credentials using:

NID || EncryptionKey || PrivacyKey = k2(NetKey, 0x00)

The friendship security material is derived from the friendship security credentials using:
NID || EncryptionKey || PrivacyKey = k2(NetKey, 0x01 || LPNAddress || FriendAddress ||
LPNCounter || FriendCounter)

Referred from section 3.8.6.3.1

Can u suggest any fields to be updated in Wireshark, to decrypt the data.

RE: Unable to Decrypt the Friendship Packets between Low Power Node and Friend Node

Hung Bui — Mon, 22 Mar 2021 17:34:41 GMT

Hi Chandu,

We haven't tried to use the nRF Sniffer to decrypt friendship communication (we usually just use the logs on both sides for debugging, instead of sniffing the communication).

But I would suggest you to have a look at section 3.6.6.2 Friendship security in Mesh Profile specification v1.0.1 for more information about encryption in friendship communication.