Abstract
Fuzzy identity-based signature (FIBS) is exactly like a traditional identity-based signature except that the signature issued under an identity \(\textsf {id}\) can be verified under any identity \(\textsf {id}'\) that is “close enough” to \(\textsf {id}\). This property allows FIBS having an efficient application in biometric authentication and only three schemes over lattices exist, among which two constructions are existentially unforgetable against adaptively chosen identity and message attacks (EU-aID-CMA) in the random model, the only exception proved to be strongly unforgetable against selectively chosen identity and message attacks (SU-sID-CMA) is constructed in the standard model. In this work, we propose a new FIBS from the hardness of lattice problems for identities living in a small universe, i.e., \(\{0,1\}^{\ell }\), the new construction is proved to be SU-sID-CMA in the standard model. In particular, compared with the existing lattice FIBS schemes, the new construction enjoys a smaller communication cost, and the faster signing and verifying operations, thus, it is more practical.
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Acknowledgments
We thank the anonymous referees for their helpful comments and the research of authors is supported by the National Natural Science Foundation of China (No. 61572445) and the Anhui Provincial Natural Science Foundation of China (No. 1708085QF154).
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Zhang, Y., Gan, Y., Yin, Y., Jia, H., Jiang, M. (2018). Efficient Lattice FIBS for Identities in a Small Universe. In: Li, F., Takagi, T., Xu, C., Zhang, X. (eds) Frontiers in Cyber Security. FCS 2018. Communications in Computer and Information Science, vol 879. Springer, Singapore. https://doi.org/10.1007/978-981-13-3095-7_7
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