computational complexitydigital signaturestelecommunication securityvehicular ad hoc networkswireless sensor networkspublic key cryptographyad hoc networkscryptographycryptographic protocolsaggregate signcryption scheme ID-ASCsecure provably identityad-hoc network VANETwireless sensor networkslow-bandwidth communication networkscommunication overheadaggregation processSelvifree identityelliptic curve cryptographypairings