
Symbol  Definition 

 Identities of users and , respectively 
 Identity of the authentication server 
 The large primes and , a generator of group with the order 
 The longterm key of , and 
 Components of authentication information and 
 Random number privately chosen by and , respectively 
 Components of session key, where and 
 Collisionfree oneway hash function 
 Evidence generated by user for user 
