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

Table 1

Notations used in this paper.

Symbol	Description
	Low-earth-orbit satellite communications system
	Mobile user
	Network control center
	Low-Earth-orbit satellite
	Attacker
	Identity of
	Identity of
	Smart card issued to each specific
	Password of
	Random numbers generated by
	Random numbers generated by
	Private/public key of
	Share session key
	Timestamp
	Point multiplication
	Hash function:
	Bitwise XOR operation
	Concatenate operation