$ cat writeup.md…
$ cat writeup.md…
compfest2026
Task: interact with an ECDSA signing service exposing public keys, a damaged record, and a transformed data panel backed by Python MT19937. Solution: invert the panel outputs, clone MT19937, predict 128 nonce MSBs, and use a 4-signature LLL/HNP attack to recover a unit secret accepted by the submit endpoint.
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