Comments on a secure certificateless ring signcryption scheme based on SM2 algorithm in smart grid
Ya‐Fen Chang, Wei‐Liang Tai, Pei-Yu Lin, Jia-Yen Wu · IET conference proceedings. · 2025
To meet the specific requirements in smart grids, Liu et al. proposed a certificateless ring signcryption scheme, CLRSC, for conditional privacy protection authentication (CPPA) with the SM2 algorithm. Liu et al. claimed that CLRSC could resist various attacks and ensure both privacy and data integrity. However, after analyzing CLRSC, we find that it suffers from three flaws. Firstly, a malicious user can generate a valid ciphertext with no private key and a random tracking mark. Secondly, the attacker can generate a valid ciphertext with a forged power consumption message. Thirdly, the mentioned functionality cannot be provided. In this paper, the details of found flaws will be given.