Many lattice-based signature schemes have been proposed in recent years. However, all of them suf... more Many lattice-based signature schemes have been proposed in recent years. However, all of them suffer from huge signature sizes as compared to their classical counterparts. We present a novel and generic construction of a lossless compression algorithm for Schnorr-like signatures utilizing publicly accessible randomness. Conceptually, exploiting public randomness in order to reduce the signature size has never been considered in cryptographic applications. We illustrate the applicability of our compression algorithm using the example of a current state-of-the-art signature scheme due to Gentry et al. (GPV scheme) instantiated with the efficient trapdoor construction from Micciancio and Peikert. This scheme benefits from increasing the main security parameter n, which is positively correlated with the compression rate measuring the amount of storage savings. For instance, GPV signatures admit improvement factors of approximately lgn implying compression rates of about 65% at a securit...
Many lattice-based signature schemes have been proposed in recent years. However, all of them suf... more Many lattice-based signature schemes have been proposed in recent years. However, all of them suffer from huge signature sizes as compared to their classical counterparts. We present a novel and generic construction of a lossless compression algorithm for Schnorr-like signatures utilizing publicly accessible randomness. Conceptually, exploiting public randomness in order to reduce the signature size has never been considered in cryptographic applications. We illustrate the applicability of our compression algorithm using the example of a current state-of-the-art signature scheme due to Gentry et al. (GPV scheme) instantiated with the efficient trapdoor construction from Micciancio and Peikert. This scheme benefits from increasing the main security parameter n, which is positively correlated with the compression rate measuring the amount of storage savings. For instance, GPV signatures admit improvement factors of approximately lgn implying compression rates of about 65% at a securit...
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