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Paper: Cryptanalysis of Curl-P and Other Attacks on the IOTA Cryptocurrency

Authors:
Ethan Heilman , Boston University, Boston, Massachusetts, United States of America
Neha Narula , Massachusetts Institute of Technology Media Lab, Cambridge, Massachusetts, United States of America
Garrett Tanzer , Harvard University, Cambridge, Massachusetts, United States of America
James Lovejoy , Massachusetts Institute of Technology Media Lab, Cambridge, Massachusetts, United States of America
Michael Colavita , Harvard University, Cambridge, Massachusetts, United States of America
Madars Virza , Massachusetts Institute of Technology Media Lab, Cambridge, Massachusetts, United States of America
Tadge Dryja , Massachusetts Institute of Technology Media Lab, Cambridge, Massachusetts, United States of America
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DOI: 10.13154/tosc.v2020.i3.367-391
URL: https://tosc.iacr.org/index.php/ToSC/article/view/8707
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Abstract: We present attacks on the cryptography formerly used in the IOTA blockchain, including under certain conditions the ability to forge signatures. We developed practical attacks on IOTA’s cryptographic hash function Curl-P-27, allowing us to quickly generate short colliding messages. These collisions work even for messages of the same length. Exploiting these weaknesses in Curl-P-27, we broke the EUCMA security of the former IOTA Signature Scheme (ISS). Finally, we show that in a chosen-message setting we could forge signatures and multi-signatures of valid spending transactions (called bundles in IOTA).
Video from TOSC 2020
BibTeX
@article{tosc-2020-30575,
  title={Cryptanalysis of Curl-P and Other Attacks on the IOTA Cryptocurrency},
  journal={IACR Transactions on Symmetric Cryptology},
  publisher={Ruhr-Universität Bochum},
  volume={2020, Issue 3},
  pages={367-391},
  url={https://tosc.iacr.org/index.php/ToSC/article/view/8707},
  doi={10.13154/tosc.v2020.i3.367-391},
  author={Ethan Heilman and Neha Narula and Garrett Tanzer and James Lovejoy and Michael Colavita and Madars Virza and Tadge Dryja},
  year=2020
}