Trusted Authority Assisted Three-Factor Authentication and Key Agreement Protocol for the Implantable Medical System

Table 1

Notations.

Notations	Description
	user and his/her mobile device
	controller node
	implantable medical device
	Trusted authority
	’s identity, password and biometric information
	Identities of and controller node
	Pseudo identities of and , registration timestamp of
	1024-bit secret number of
	Current timestamp
	Maximum transmission delay associated with a message
	Error tolerance threshold used in fuzzy extractor
	Elliptic curve point multiplication,
	Collision-resistant cryptographic hash function
	Concatenation operation
	Bitwise XOR operation