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The Lattice-Based Digital Signature Scheme qTESLA

: Alkim, E.; Barreto, P.S.L.M.; Bindel, N.; Krämer, J.; Longa, P.; Ricardini, J.E.


Conti, M.:
Applied Cryptography and Network Security. 18th International Conference, ACNS 2020. Proceedings. Pt.I : Rome, Italy, October 19-22, 2020, virtual conference
Cham: Springer Nature, 2020 (Lecture Notes in Computer Science 12146)
ISBN: 978-3-030-57807-7 (Print)
ISBN: 978-3-030-57808-4 (Online)
ISBN: 978-3-030-57809-1
International Conference on Applied Cryptography and Network Security (ACNS) <18, 2020, Online>
Fraunhofer SIT ()

We present qTESLA, a post-quantum provably-secure digital signature scheme that exhibits several attractive features such as simplicity, strong security guarantees against quantum adversaries, and built-in protection against certain side-channel and fault attacks. qTESLA-selected for round 2 of NIST’s post-quantum cryptography standardization project—consolidates a series of recent schemes originating in works by Lyubashevsky, and Bai and Galbraith. We provide full-fledged, constant-time portable C implementations consisting of only about 300 lines of C code, which showcases the code compactness of the scheme. Our results also demonstrate that a conservative, provably-secure signature scheme can be efficient and practical, even with a compact and portable implementation. For instance, our C-only implementation executes signing and verification in approximately 0.9 ms on an x64 Intel processor using the proposed level 1 parameter set. Finally, we also provide AVX2-optimized assembly implementations that achieve an additional factor-1.5 speedup.