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Paper 2020/1344

Indifferentiability of SKINNY-HASH Internal Functions

Akinori Hosoyamada and Tetsu Iwata

Abstract

We provide a formal proof for the indifferentiability of SKINNY-HASH internal function from a random oracle. SKINNY-HASH is a family of function-based sponge hash functions, and it was selected as one of the second round candidates of the NIST lightweight cryptography competition. Its internal function is constructed from the tweakable block cipher SKINNY. The construction of the internal function is very simple and the designers claim $n$-bit security, where $n$ is the block length of SKINNY. However, a formal security proof of this claim is not given in the original specification of SKINNY-HASH. In this paper, we formally prove that the internal function of SKINNY-HASH has $n$-bit security, i.e., it is indifferentiable from a random oracle up to $O(2^n)$ queries, substantiating the security claim of the designers.

Note: Minor revision: Some information on related works is added.

Metadata
Available format(s)
PDF
Category
Secret-key cryptography
Publication info
Preprint. MINOR revision.
Keywords
provable securitysponge constructionindifferentiabilitySKINNYSKINNY-HASH
Contact author(s)
akinori hosoyamada bh @ hco ntt co jp,hosoyamada akinori @ nagoya-u jp,tetsu iwata @ nagoya-u jp
History
2020-11-02: revised
2020-10-29: received
See all versions
Short URL
https://ia.cr/2020/1344
License
Creative Commons Attribution
CC BY
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