Paper 2023/823
Lattice-based Authenticated Key Exchange with Tight Security
, Norwegian University of Science and Technology, CISPA Helmholtz Center for Information Security, Saarland University, Norwegian University of Science and TechnologyAbstract
We construct the first tightly secure authenticated key exchange (AKE) protocol from lattices. Known tight constructions are all based on Diffie-Hellman-like assumptions. Thus, our protocol is the first construction with tight security from a post-quantum assumption. Our AKE protocol is constructed tightly from a new security notion for key encapsulation mechanisms (KEMs), called one-way security against checkable chosen-ciphertext attacks (OW- ChCCA). We show how an OW-ChCCA secure KEM can be tightly constructed based on the Learning With Errors assumption, leading to the desired AKE protocol. To show the usefulness of OW-ChCCA security beyond AKE, we use it to construct the first tightly bilateral selective-opening (BiSO) secure PKE. BiSO security is a stronger selective-opening notion proposed by Lai et al. (ASIACRYPT 2021).
Note: Minor Editorial Changes
Metadata
- Available format(s)
-
PDF
- Category
- Public-key cryptography
- Publication info
- A minor revision of an IACR publication in CRYPTO 2023
- Keywords
- Authenticated Key ExchangeLatticesTight SecuritySelective-Opening SecurityRandom Oracle
- Contact author(s)
-
jiaxin pan @ ntnu no
benedikt wagner @ cispa de
runzhi zeng @ ntnu no - History
- 2023-06-07: last of 2 revisions
- 2023-06-02: received
- See all versions
- Short URL
- https://ia.cr/2023/823
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2023/823,
author = {Jiaxin Pan and Benedikt Wagner and Runzhi Zeng},
title = {Lattice-based Authenticated Key Exchange with Tight Security},
howpublished = {Cryptology {ePrint} Archive, Paper 2023/823},
year = {2023},
url = {https://eprint.iacr.org/2023/823}
}
