On the Security of Certificateless Aggregate Signature Scheme in Vehicular Ad Hoc Networks

Certificateless aggregate signature scheme is a very effective technique for ad hoc networks such as vehicular ad hoc network. An aggregate scheme aggregates the individual signature, which reduces the computational overhead and useful in the areas, where bandwidth limitation is a major issue. Recently, Malhi and Batra proposed a certificateless aggregate signature scheme for vehicular ad hoc networks and proved the scheme mathematically secure against possible types of security attacks. In this paper, we present the cryptanalysis of the scheme while applying some concrete attack “honest but curious”. The additional contribution to this paper is an improvement of the certificateless aggregated signature scheme.

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