SIKE Broken
Schneier on Security
AUGUST 4, 2022
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 pro
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