《Table 2 Signed message length description》

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《Fast Confidentiality-Preserving Authentication for Vehicular Ad Hoc Networks》

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In certificate，RSA provided signed Vi’s initials which include message and signature with 1 024 bit（128 byte）.Vi’s ID would take almost 1 byte and its public key length would be interpreted to the length of point Bwhich is 160 bit or 20 byte.Other parameters included in Vi’s public key are known to the verifier a priori，so there is no requirement to transfer them.Message can occupy any arbitrary length；however，its length is not considered in our statement since message payload has not been calculated as communication cost in the past researches.As mentioned before，Vi’s signed message is formed by uiand vipairs，each of them having 160 bit or 20 byte length.This causes signature’s length to be equal to 320 bit or 40 byte in total.Signed message length is shown in Table 2；the total length is 189 byte.Compared with synonym schemes proposed on the basis of ID based structure，our new suggested scheme displays outstanding performance in both satisfying security aspects and being convincingly compact consid-ering its certificate based nature[24].In addition，rivals suffer from numerous security drawbacks which are impossible to get rectified.