International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Key Prediction Security of Keyed Sponges

Bart Mennink , Digital Security Group, Radboud University, Nijmegen
DOI: 10.13154/tosc.v2018.i4.128-149
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Presentation: Slides
Abstract: The keyed sponge is a well-accepted method for message authentication. It processes data at a certain rate by sequential evaluation of an underlying permutation. If the key size k is smaller than the rate, currently known bounds are tight, but if it exceeds the rate, state of the art only dictates security up to 2k/2. We take closer inspection at the key prediction security of the sponge and close the remaining gap in the existing security analysis: we confirm key security up to close to 2k, regardless of the rate. The result impacts all applications of the keyed sponge and duplex that process at a rate smaller than the key size, including the STROBE protocol framework, as well as the related constructions such as HMAC-SHA-3 and the sandwich sponge.
Video from TOSC 2018
  title={Key Prediction Security of Keyed Sponges},
  journal={IACR Transactions on Symmetric Cryptology},
  publisher={Ruhr-Universit├Ąt Bochum},
  volume={2018, Issue 4},
  author={Bart Mennink},