Cryptanalysis of an Effective Certificateless Aggregate Signcryption Scheme

For V2G communication, Wang et al. proposed an effective and reliable certificateless aggregate signcryption scheme to preserve the confidentiality, integrity, and authenticity of the shared data. They demonstrated that their scheme achieves unforgeability. However, we have proven that their scheme can be compromised by an <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$A_{1}$</tex> adversary. We present a detailed examination of these vulnerabilities and propose an improved scheme that resolves them. Through a performance evaluation, we demonstrate that our proposed scheme offers superior computational and communication efficiency compared to related approaches.