Post-quantum security of the sponge construction

Jan Czajkowski; Leon Groot Bruinderink; Andreas Hülsing; Christian Schaffner; Dominique Unruh

Paper 2017/771

Post-quantum security of the sponge construction

Jan Czajkowski, Leon Groot Bruinderink, Andreas Hülsing, Christian Schaffner, and Dominique Unruh

Abstract

We investigate the post-quantum security of hash functions based on the sponge construction. A crucial property for hash functions in the post-quantum setting is the collapsing property (a strengthening of collision-resistance). We show that the sponge construction is collapsing (and in consequence quantum collision-resistant) under suitable assumptions about the underlying block function. In particular, if the block function is a random function or a (non-invertible) random permutation, the sponge construction is collapsing.

Note: This work merges and supersedes IACR eprint reports 2017/282 and 2017/302.

Metadata

Available format(s): PDF
Publication info: Preprint. MINOR revision.
Keywords: Post-quantum cryptography hash functions Sponge construction collapsing collision-resistance quantum adversaries quantum attack
Contact author(s): authors-quantum-sponges @ huelsing net
History: 2017-08-13: received
Short URL: https://ia.cr/2017/771
License: CC BY

BibTeX

@misc{cryptoeprint:2017/771,
      author = {Jan Czajkowski and Leon Groot Bruinderink and Andreas Hülsing and Christian Schaffner and Dominique Unruh},
      title = {Post-quantum security of the sponge construction},
      howpublished = {Cryptology {ePrint} Archive, Paper 2017/771},
      year = {2017},
      url = {https://eprint.iacr.org/2017/771}
}