Conference paper Open Access

Square Attack on 7-Round Kiasu-BC

Dobraunig, Christoph; Eichlseder, Maria; Mendel, Florian


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  <identifier identifierType="DOI">10.5281/zenodo.55445</identifier>
  <creators>
    <creator>
      <creatorName>Dobraunig, Christoph</creatorName>
      <givenName>Christoph</givenName>
      <familyName>Dobraunig</familyName>
      <affiliation>TU Graz</affiliation>
    </creator>
    <creator>
      <creatorName>Eichlseder,  Maria</creatorName>
      <givenName>Maria</givenName>
      <familyName>Eichlseder</familyName>
      <affiliation>TU Graz</affiliation>
    </creator>
    <creator>
      <creatorName>Mendel, Florian</creatorName>
      <givenName>Florian</givenName>
      <familyName>Mendel</familyName>
      <affiliation>TU Graz</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Square Attack on 7-Round Kiasu-BC</title>
  </titles>
  <publisher>Zenodo</publisher>
  <publicationYear>2016</publicationYear>
  <dates>
    <date dateType="Issued">2016-06-19</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Conference paper</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/55445</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf">https://zenodo.org/communities/ecfunded</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf">https://zenodo.org/communities/hector</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="http://creativecommons.org/licenses/by-nc-sa/4.0/legalcode">Creative Commons Attribution Non Commercial Share Alike 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;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.&lt;/p&gt;

&lt;p&gt;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 2&lt;sup&gt;48:5&lt;/sup&gt; 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 2&lt;sup&gt;82&lt;/sup&gt; encryptions.&lt;/p&gt;

&lt;p&gt; &lt;/p&gt;</description>
    <description descriptionType="Other">H2020 644052 / HECTOR</description>
  </descriptions>
  <fundingReferences>
    <fundingReference>
      <funderName>European Commission</funderName>
      <funderIdentifier funderIdentifierType="Crossref Funder ID">10.13039/501100000780</funderIdentifier>
      <awardNumber awardURI="info:eu-repo/grantAgreement/EC/H2020/644052/">644052</awardNumber>
      <awardTitle>HARDWARE ENABLED CRYPTO AND RANDOMNESS</awardTitle>
    </fundingReference>
  </fundingReferences>
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