RAMHU: A New Robust Lightweight Scheme for Mutual Users Authentication in Healthcare Applications

Table 3

Paper’s notations.

Symbol	Description
	Client entity or user
	Central server
	Attributes server
	Data server
	’s identity and medical centre identity
	’s password, temporary password
	public and private key
	public and private key
	public and private key
	Timestamp generated by
	Nonce random generated by
	Internal or external intruder
	Internal intruder and external intruder
	One-way hash function
	Role of patient, patient relative, or provider
	Revocation reason
	One-time password to authenticate first time
	Signature generated by and j is signature number
	Signature generated by
	Signature generated by
	User and medical centre pseudonyms sent by and verified by
	User and medical centre pseudonyms sent by and verified by
	User and medical centre pseudonyms sent by and verified by
	User and medical centre pseudonyms sent by and verified by
	Concatenation and exclusive or operations
	Get MAC and check MAC address
	Encryption and decryption operations