Cryptology ePrint Archive: Report 2017/667

High-speed key encapsulation from NTRU

Andreas Hülsing and Joost Rijneveld and John M. Schanck and 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.

Category / Keywords: implementation / Post-quantum crypto, lattice-based crypto, NTRU, CCA2-secure KEM, QROM, AVX2

Original Publication (with major differences): IACR-CHES-2017

Date: received 3 Jul 2017, last revised 29 Aug 2017

Contact author: authors-ntrukem at joostrijneveld nl

Available format(s): PDF | BibTeX Citation

Version: 20170829:225239 (All versions of this report)

Short URL: ia.cr/2017/667

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