March 5, 2017 Conference paper Open Access

Christoph Dobraunig; Maria Eichlseder; Daniel Kales; Florian Mendel

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    "description": "<p>MANTIS is a lightweight tweakable block cipher published at CRYPTO 2016. In addition to the full 14-round version, MANTIS<sub>7</sub>, the designers also propose an aggressive 10-round version, MANTIS5. The security claim for MANTIS<sub>5</sub> is resistance against \u201cpractical attacks\u201d, defined as related-tweak attacks with data complexity 2<sup>d</sup> less than 2<sup>30</sup> chosen plaintexts (or 2<sup>40</sup> known plaintexts), and computational complexity at most 2<sup>126\u2212d</sup>. We present a key-recovery attack against MANTIS<sub>5</sub> with 2<sup>28</sup> chosen plaintexts and a<br>\ncomputational complexity of about 2<sup>38</sup> block cipher calls, which violates this claim. Our attack is based on a family of differential characteristics and exploits several properties of the lightweight round function and tweakey schedule. To verify the validity of the attack, we also provide a practical implementation which recovers the full key in about 1 core hour using 2<sup>30</sup> chosen plaintexts.</p>", 
    "license": {
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    "title": "Practical Key-Recovery Attack on MANTIS-5", 
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    "keywords": [
      "differential cryptanalysis", 
      "MANTIS", 
      "lightweight", 
      "PRINCE-like ciphers"
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    "publication_date": "2017-03-05", 
    "creators": [
      {
        "affiliation": "Graz University of Technology", 
        "name": "Christoph Dobraunig"
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      {
        "affiliation": "Graz University of Technology", 
        "name": "Maria Eichlseder"
      }, 
      {
        "affiliation": "Graz University of Technology", 
        "name": "Daniel Kales"
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      {
        "affiliation": "Graz University of Technology", 
        "name": "Florian Mendel"
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    "meeting": {
      "acronym": "FSE 2017", 
      "url": "http://www.nuee.nagoya-u.ac.jp/labs/tiwata/fse2017/", 
      "dates": "5-8 March 2017", 
      "place": "Tokyo", 
      "title": "International Conference on Fast Software Encryption"
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