Abstract. We present a quantumly secure identity-based signature
scheme based on the standard short integer solution problem, featuring tight security reductions in the quantum and classic random oracle
models. The scheme has short signatures. Each signature contains a single lattice vector plus a single bit. Com服务器托管网pared to the existing tightly
secure, short lattice identity-based signature schemes by Pan and Wagner 服务器托管网(PQCrypto’21), our scheme has a shorter signature size (around 30%
shorter), stronger unforgeability, relies on a weaker assumption, and has
detailed proof in the quantum random oracle model.
Keywords: Identity-based signature strong unforgeability lattice quantum random oracle model
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