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There is an inherent difficulty in building 3-move ID schemes based on combinatorial problems without much algebraic structure. A consequence of this, is that most standard ID schemes today are based on the hardness of number theory problems. Not having schemes based on alternate assumptions is a cause for concern since improved number theoretic algorithms or the realization of quantum computing would make the known schemes insecure. In this work, we examine the possibility of creating identification protocols based on the hardness of lattice problems. We construct a 3-move identification scheme whose security is based on the worst-case hardness of the shortest vector problem in all lattices, and also present a more efficient version based on the hardness of the same problem in ideal lattices.

Lattice-Based Identification Schemes Secure Under Active Attacks