$ cat writeup.md…
$ cat writeup.md…
hxp_39c3
Task: break an SIDH-like isogeny cryptosystem with noisy point pairs to decrypt the flag. Solution: eliminate error terms by multiplying all points by 3^n3 (which kills the error of that order), recover the isogeny via Weil pairing discrete logs on torsion points, then solve for the secret.
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