I did not yet have the time to read this paper property but if the results as claimed are correct this is very impressive and I think that the EF was wrong in dismissing it as out of "intended" scope.
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We found a full collision for the Poseidon1 Collision Prize instance and submitted it on July 31.
Two different messages, identical 16-word output after all 28 rounds, verified on the Initiative's official implementation.
The technical breakdown and full story ⬇️