Conference paper Open Access

Square Attack on 7-Round Kiasu-BC

Dobraunig, Christoph; Eichlseder, Maria; Mendel, Florian


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    <dct:description>&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;</dct:description>
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