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SIKE Broken
Aug. 4, 2022, 11:56 a.m. | Bruce Schneier
Schneier on Security www.schneier.com
SIKE is one of the new algorithms that NIST recently added to the post-quantum cryptography competition.
It was just broken, really badly.
We present an efficient key recovery attack on the Supersingular Isogeny Diffie-Hellman protocol (SIDH), based on a “glue-and-split” theorem due to Kani. Our attack exploits the existence of a small non-scalar endomorphism on the starting curve, and it also relies on the auxiliary torsion point information that Alice and Bob share during the protocol. Our Magma implementation …
algorithms cryptanalysis cryptography encryption nist quantum computing sike
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