Conference paper Open Access

Square Attack on 7-Round Kiasu-BC

Dobraunig, Christoph; Eichlseder, Maria; Mendel, Florian


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{
  "description": "<p>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.</p>\n\n<p>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<sup>48:5</sup> 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<sup>82</sup> encryptions.</p>\n\n<p>\u00a0</p>", 
  "license": "https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode", 
  "creator": [
    {
      "affiliation": "TU Graz", 
      "@type": "Person", 
      "name": "Dobraunig, Christoph"
    }, 
    {
      "affiliation": "TU Graz", 
      "@type": "Person", 
      "name": "Eichlseder,  Maria"
    }, 
    {
      "affiliation": "TU Graz", 
      "@type": "Person", 
      "name": "Mendel, Florian"
    }
  ], 
  "headline": "Square Attack on 7-Round Kiasu-BC", 
  "image": "https://zenodo.org/static/img/logos/zenodo-gradient-round.svg", 
  "datePublished": "2016-06-19", 
  "url": "https://zenodo.org/record/55445", 
  "@context": "https://schema.org/", 
  "identifier": "https://doi.org/10.5281/zenodo.55445", 
  "@id": "https://doi.org/10.5281/zenodo.55445", 
  "@type": "ScholarlyArticle", 
  "name": "Square Attack on 7-Round Kiasu-BC"
}
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