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>", 
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    "title": "Square Attack on 7-Round Kiasu-BC", 
    "notes": "H2020 644052 / HECTOR", 
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    "publication_date": "2016-06-19", 
    "creators": [
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        "affiliation": "TU Graz", 
        "name": "Dobraunig, Christoph"
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      {
        "affiliation": "TU Graz", 
        "name": "Eichlseder,  Maria"
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      {
        "affiliation": "TU Graz", 
        "name": "Mendel, Florian"
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      "acronym": "ACNS 2016", 
      "url": "http://acns2016.sccs.surrey.ac.uk/index.html", 
      "dates": "19-22 June 2016", 
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      "title": "14th International Conference on Applied Cryptography and Network Security"
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