Conference paper Open Access

Square Attack on 7-Round Kiasu-BC

Dobraunig, Christoph; Eichlseder, Maria; Mendel, Florian

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  "publisher": "Zenodo", 
  "DOI": "10.5281/zenodo.55445", 
  "title": "Square Attack on 7-Round Kiasu-BC", 
  "issued": {
    "date-parts": [
  "abstract": "<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>", 
  "author": [
      "family": "Dobraunig, Christoph"
      "family": "Eichlseder,  Maria"
      "family": "Mendel, Florian"
  "note": "H2020 644052 / HECTOR", 
  "type": "paper-conference", 
  "id": "55445"
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