Low-Cost Authentication Protocol for D2D Communication in m-Health with Trust Evaluation

Table 1

Parameters used in the protocol.

Symbol	Description
	Patient or device , where
	Large public prime numbers
	A finite field of order /prime field of order
	Elliptic curve over
	Group of order
	A subgroup of of order
	Point generator of ;
	Random polynomial;
	Master private key
	Master public key
	Private key of device
	Public key of device
	Real identity of entity /temporary identity of entity
	random number generated
	Timestamp generated by entity HSS;
	Temporary identity generation hash function;
	Device’s partial private key generation hash function;
	Symmetric key generation hash function;
	Shamir’s secret hash function
	Local trust level of device
	Local trust secret key
	Secure channel
	Insecure channel