NUMBER-THEORETIC TRANSFORM PROCESSING APPARATUS, NUMBER-THEORETIC TRANSFORM PROCESSING METHOD, AND COMPUTER PROGRAM PRODUCT

摘要

According to an embodiment, a number-theoretic transform processing apparatus for a noise in lattice-based cryptography, includes a processor configured to perform number-theoretic transform of the noise using a precomputation table including a combination of products of one or more elements that belong to a subspace of a finite field Zq and indicate coefficients of the noise, with one or more number-theoretic transform constants.