Abstract
NTRUEncrypt is a parameterized family of lattice-based public key cryptosystems. Similar to other public key systems, it is susceptible to fault analysis attacks. In this paper, we investigate several techniques to strengthen hardware implementations of NTRUEncrypt against this class of attacks. In particular, by utilizing the algebraic structure of the cipher, we propose several countermeasures based on error detection checksum codes, and spatial/temporal redundancies. The error detection capabilities of these countermeasures, as well as their impact on the decryption throughput and area, are also presented.
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