Conference paper Open Access

Square Attack on 7-Round Kiasu-BC

Dobraunig, Christoph; Eichlseder, Maria; Mendel, Florian


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  <dc:creator>Dobraunig, Christoph</dc:creator>
  <dc:creator>Eichlseder,  Maria</dc:creator>
  <dc:creator>Mendel, Florian</dc:creator>
  <dc:date>2016-06-19</dc:date>
  <dc:description>Kiasu-BC is a tweakable block cipher presented within the TWEAKEY framework at AsiaCrypt 2014. Kiasu-BC is almost identical to AES-128, the only difference to AES-128 is the tweak addition, where the 64-bit tweak is xored to the first two rows of every round-key.

The security analysis of the designers focuses primarily on related-key related-tweak differential characteristics and meet-in-the-middle attacks. For other attacks, they conclude that the security level of Kiasu-BC is similar to AES-128. In this work, we provide the first third-party analysis of Kiasu-BC. We show that we can mount Square attacks on up to 7-round Kiasu-BC with a complexity of about 248:5 encryptions, which improves upon the best published 7-round attacks for AES-128. Furthermore, we show that such attacks are applicable to the round-reduced JCB3-like mode of the CAESAR candidate Kiasu6=. To be specific, we show a key-recovery attack on 7-round Kiasu6= with a complexity of about 282 encryptions.

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  <dc:description>H2020 644052 / HECTOR</dc:description>
  <dc:identifier>https://zenodo.org/record/55445</dc:identifier>
  <dc:identifier>10.5281/zenodo.55445</dc:identifier>
  <dc:identifier>oai:zenodo.org:55445</dc:identifier>
  <dc:relation>info:eu-repo/grantAgreement/EC/H2020/644052/</dc:relation>
  <dc:relation>url:https://zenodo.org/communities/ecfunded</dc:relation>
  <dc:relation>url:https://zenodo.org/communities/hector</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode</dc:rights>
  <dc:title>Square Attack on 7-Round Kiasu-BC</dc:title>
  <dc:type>info:eu-repo/semantics/conferencePaper</dc:type>
  <dc:type>publication-conferencepaper</dc:type>
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