Collapsing sponges: Post-quantum security of the sponge construction

Dominique Unruh

Paper 2017/282

Collapsing sponges: Post-quantum security of the sponge construction

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.

Metadata

Available format(s): PDF
Category: Foundations
Publication info: Preprint. MINOR revision.
Keywords: quantum cryptography hash functions
Contact author(s): unruh @ ut ee
History: 2017-03-30: received
Short URL: https://ia.cr/2017/282
License: CC BY

BibTeX

@misc{cryptoeprint:2017/282,
      author = {Dominique Unruh},
      title = {Collapsing sponges: Post-quantum security of the sponge construction},
      howpublished = {Cryptology {ePrint} Archive, Paper 2017/282},
      year = {2017},
      url = {https://eprint.iacr.org/2017/282}
}