Efficient Multifactor Two-Server Authenticated Scheme under Mobile Cloud Computing

Table 2

Symbols meanings.

Symbols	Meaning
U	User
WS	Web server
AS	Authentication server
u	Username
pw	Password
phn	Phone number
fp	Fingerprint
DVC	Dynamic verification code
n	Temporary number
hpw	The hash of the password
	The public/ private key pair of X
K	Session key
	Encrypt the message M by the key K
	Signature of M
	Hash function
AuthLevel	Authentication Level, can be High/ Low
BaResult	Basic authentication result, can be Success/ Failure
TranResult	Transaction authentication result, can be Success/ Failure
LocResult	Local authentication result, can be Success/ Failure