International Association
for Cryptologic Research

To accomplish effective privacy protection in smart grid systems, various approaches were proposed combining information security technology with the smart grid\'s new features. Diao et al. proposed a privacy-preserving scheme using linkable anonymous credential based on CL signature, and demonstrated its identity anonymity, message authentication and traceability of broken smart meters. In this paper, a forgery attack is presented to point out the protocol dissatisfies message authentication and unforgeability. We hold the idea that this scheme doesn\'t have basic safety requirements and application value.