A signature generation apparatus and {HEAD ~ a signature verification apparatus} which can prevent {TAIL ~ the occurrence} of norm zero vector forgery attack 
prevent
A signature generation apparatus and { HEAD ~ a signature verification apparatus } which can prevent { TAIL ~ the occurrence } of norm zero vector forgery attack
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH