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 funko wall-e grande Privacy-Preserving Certificateless Aggregate Signature Scheme in the Standard Model for VANETs,” a pairing-based certificateless aggregate signature (CLAS) scheme was proposed.However, a malicious-but-passive KGC attack on this scheme was subsequently presented by Shim.In this paper, we show that even if the gorra we are not friends 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.