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Table 1 Notation.

From: Tree Based Protocol for Key Management in Wireless Sensor Networks

Notation Description
th sensor node in the network, denotes the (unique) identifier of the sensor node.
The encryption of message with key .
*: A nodeS broadcasts the message , any node in the radius of perception of the BS receives the message .
The Message Authentication Code of the message with the symmetric key .
The concatenation of the information with information .
A nonce generated by node S i .