An Improved Broadcast Authentication Protocol for Wireless Sensor Networks Based on the Self-Reinitializable Hash Chains

Table 1

Notations used in the protocol.

Symbols	Description
	Length of hash chain
	Output length of hash function
	The secret that needs to be shared
	Secret shares
,	Seed of hash chain
	Number of secret shares
,	Key authentication code
	Current time used to synchronize the time of the whole network
	Maximum clock difference between the sender and the receiver
	The start time of interval
	Duration of each time interval
	Disclosure delay
	Sensor node
,	Private key and public key of sensor node, respectively
	Base station
,	The addresses of sensor node and base station, respectively
,	Random nonce