Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2019/05/cryptanalysis_o_4.html
A weird paper was posted on the Cryptology ePrint Archive (working link is via the Wayback Machine), claiming an attack against the NSA-designed cipher SIMON. You can read some commentary about it here. Basically, the authors claimed an attack so devastating that they would only publish a zero-knowledge proof of their attack. Which they didn’t. Nor did they publish anything else of interest, near as I can tell.
The paper has since been deleted from the ePrint Archive, which feels like the correct decision on someone’s part.