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Title:
Collapsing sponges: Post-quantum security of the sponge construction
Authors: 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.
ePrint: https://eprint.iacr.org/2017/282
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