Cryptanalysis of Efficient Certificateless Aggregate Signature Scheme

Certificateless signature scheme becomes a most attractive area for researchers to provide a lot of potential to secure network against malicious adversaries. Aggregate signature is a many to one map that allows mapping n users signature in to single short signature. Aggregate signatures reduce the bandwidth used in the network which is useful in many practical areas where bandwidth is a major issue like vehicular ad-hoc network, PDA, wireless sensor network and an endless list. Recently, Deng et al.’s proposed a secure certificate aggregate signature scheme and claims that their scheme is secure against malicious adversaries present in the network. Unfortunately, we found that their proposed scheme is not secure against collision resistance attack. In this paper, we demonstrate that Deng et al.’s proposed scheme is fails to protect collision resistant property.