A Composable Multifactor Identity Authentication and Authorization Scheme for 5G Services

Algorithm 3

Biometrics update.

	Require: the user identity ; the password ; the biometric data ; the smart card.
	Ensure: update the result: 0 for failure; 1 for success.
(1)	and user execute the mutual authentication process. The security level is set to 3. If the authentication failed, Output 0. Otherwise, go ahead.
(2)	User works as follows.
(i)	Input new biometric data as same as those in the biometrics registration phase. The trusted device generates a new pair .
(ii)	Calculate new .
(iii)	Send , biometrics update request to .
(3)	Upon the receipt of the message, works as follows.
(i)	Choose a new number and encrypt with by using .
(ii)	Calculate and .
(iii)	Set and
(iv)	Store in its database.
(v)	Send to .
(4)	After receiving the message, encrypts with and stores in the smart card. And Output 1.