High-speed key encapsulation from NTRU

Andreas Hülsing; Joost Rijneveld; John M.  Schanck; Peter Schwabe

Paper 2017/667 Original: eprint.iacr.org/2017/667 ↗

High-speed key encapsulation from NTRU

Andreas Hülsing

Joost Rijneveld

John M. Schanck

Peter Schwabe

Abstract

This paper presents software demonstrating that the 20-year-old NTRU cryptosystem is competitive with more recent lattice-based cryptosystems in terms of speed, key size, and ciphertext size. We present a slightly simplified version of textbook NTRU, select parameters for this encryption scheme that target the 128-bit post-quantum security level, construct a KEM that is CCA2-secure in the quantum random oracle model, and present highly optimized software targeting Intel CPUs with the AVX2 vector instruction set. This software takes only 307914 cycles for the generation of a keypair, 48646 for encapsulation, and 67338 for decapsulation. It is, to the best of our knowledge, the first NTRU software with full protection against timing attacks.

Metadata

Available format(s): PDF
Category: Implementation
Publication info: Preprint.
History: 2017-08-29: last updated; 2017-07-05: published
Short URL: https://ia.cr/2017/667
License: https://creativecommons.org/licenses/by/4.0/

BibTeX

@misc{cryptoeprint:2017/667,
      author = {Andreas Hülsing and Joost Rijneveld and John M.  Schanck and Peter Schwabe},
      title = {High-speed key encapsulation from NTRU},
      howpublished = {Cryptology {ePrint} Archive, Paper 2017/667},
      year = {2017},
      url = {https://eprint.iacr.org/2017/667}
}