Comments on “A Conditional Privacy-Preserving Certificateless Aggregate Signature Scheme in the Standard Model for VANETs”

Comments on “A Conditional Privacy-Preserving Certificateless Aggregate Signature Scheme in the Standard Model for VANETs”

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In the above paper “A Conditional Privacy-Preserving Certificateless Aggregate Signature Scheme in the Standard Model for VANETs,” a pairing-based certificateless aggregate signature (CLAS) scheme was proposed.However, ninkasi lager a malicious-but-passive KGC attack on this scheme was subsequently presented by med mizer allcare bed Shim.In this paper, we show that even if the CLAS scheme is modified to prevent malicious-but-passive KGC attacks by incorporating Shim’s countermeasure, there are still weaknesses that allow an adversary to forge aggregate or individual signatures.