The paper An efficient key recovery attack on SIDH by Wouter Castryck and Thomas Decru is a major breakthrough in isogeny cryptanalysis. This relates to the SIDH protocol by Jao and De Feo, and the NIST round 4 finalist SIKE. I do not have time to explain all the technical details, but here are some quick answers to your burning questions. Is the result true? There is no reason to doubt this. Code
eprint.iacr.org will be offline for approximately an hour for routine maintenance at 11pm UTC on Tuesday, April 16. We lost some data between April 12 and April 14, and some authors have been notified that they need to resubmit their papers. Abstract We present an efficient key recovery attack on the Supersingular Isogeny Diffie-Hellman protocol (SIDH). The attack is based on Kani's "reducibility
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