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

Ethan Heilman, Neha Narula, Garrett Tanzer, James Lovejoy, Michael Colavita, Madars Virza, Tadge Dryja
2020 IACR Transactions on Symmetric Cryptology  
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
more » ... tting we could forge signatures and multi-signatures of valid spending transactions (called bundles in IOTA).
doi:10.13154/tosc.v2020.i3.367-391 dblp:journals/tosc/HeilmanNTLCVD20 fatcat:4flxxmbivbf5pdbe5l4k5hck4q