Cryptanalysis of "FS-PEKS: Lattice-based Forward Secure Public-key Encryption with Keyword Search for Cloud-assisted Industrial Internet of Things"
In this note, we review lattice-based public-key encryption with the keyword search against inside keyword guess attacks (IKGAs) proposed by Zhang et al. in IEEE Transactions on Dependable and Secure Computing in 2021. We demonstrate that this scheme is insecure for IKGAs, although Zhang et al. demonstrated a secure proof. Keywords— Public-key Encryption with Keyword Search, Lattice-based, Insider Keyword Guessing Attack, Cryptanalysis