Rejoining the Network Sample Clauses

Rejoining the Network. On rejoin, the node will send a REJOIN message along with its id and a nonce nd to the network. The coordinator will then send a nonce nc along with the MAC of the nonce nd to the rejoining node. The MAC key Kmd is computed by applying a pseudorandom or hash function to the group key that was stored when the rejoining node left the network. The rejoining node computes the same MAC key and verifies the nonce nd. This assures the rejoining node that the coordinator is legitimate, i.e., that it is rejoining the right network. It may be necessary to change coordinators while a mobile node is away from the home network. In this case, to maintain backward secrecy, the new coordinator is given this MAC key (rather than the group key) to authenticate itself to the mobile node. The rejoining node will then create a signature using its private key over the saved message hashes that it has stored (in the order of node identifiers) and the nonce nc and present it to the coordinator for re-entry. The coordinator will first check that the device has returned to the network within the valid- ity interval and then verify the signature. The use of a challenge guarantees the freshness of the rejoin request. The use of message hashes as opposed to the actual messages not only saves space, but also preserves the privacy of the nodes’ communications. A pre-image resistant cryptographic hash function guarantees that the original message can not be retrieved from the hashed messages. If the signature verifies and the validity time interval is within bounds, the coordinator re-keys the group key of the network and the node re- joins the network seamlessly without involving the owner. The sequence of messages exchanged on a successful rejoin is depicted in Figure 2. If the signature is not valid or the time interval is not within bounds, the owner should be notified to explicitly authenticate the device. In effect, a device presenting an invalid signature or rejoining after the validity time interval has passed is considered to be joining the network for the first time. REJOIN , id, nd - MACKmd (nd), nc SigKsd (h(msghash || nc)) - (Kg)Ked Coordinator Device
Sample 1
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