An Efficient ECC-Based Authentication Scheme against Clock Asynchronous for Spatial Information Network

Algorithm 1

Offline password-guessing attack.

	Input: , and .
	Output: , which is the private key only known to .
(1)	generates a random number and takes it as key
(2)	Computes
(3)	Ifthen
Return ()
	else
	Go to 1 until correct key is obtained