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Paper 2019/040

NTTRU: Truly Fast NTRU Using NTT

Vadim Lyubashevsky and Gregor Seiler

Abstract

We present NTTRU -- an IND-CCA2 secure NTRU-based key encapsulation scheme that uses the number theoretic transform (NTT) over the cyclotomic ring $Z_{7681}[X]/(X^{768}-X^{384}+1)$ and produces public keys and ciphertexts of approximately $1.25$ KB at the $128$-bit security level. The number of cycles on a Skylake CPU of our constant-time AVX2 implementation of the scheme for key generation, encapsulation and decapsulation is approximately $6.4$K, $6.1$K, and $7.9$K, which is more than 30X, 5X, and 8X faster than these respective procedures in the NTRU schemes that were submitted to the NIST post-quantum standardization process. These running times are also, by a large margin, smaller than those for all the other schemes in the NIST process. We also give a simple transformation that allows one to provably deal with small decryption errors in OW-CPA encryption schemes (such as NTRU) when using them to construct an IND-CCA2 key encapsulation.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
Preprint. MINOR revision.
Keywords
NTRULattice CryptographyAVX2NTT
Contact author(s)
vadim lyubash @ gmail com,gseiler @ inf ethz ch
History
2020-02-09: last of 4 revisions
2019-01-17: received
See all versions
Short URL
https://ia.cr/2019/040
License
Creative Commons Attribution
CC BY
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