Obfuscated Key Exchange
Felix Günther, Douglas Stebila, et al.
CCS 2024
We present new side-channel attacks on SIKE, the isogeny-based candidate in the NIST PQC competition. Previous works had shown that SIKE is vulnerable to differential power analysis, and pointed to coordinate randomization as an effective countermeasure. We show that coordinate randomization alone is not sufficient, because SIKE is vulnerable to a class of attacks similar to refined power analysis in elliptic curve cryptography, named zero-value attacks. We describe and confirm in the lab two such attacks leading to full key recovery, and analyze their countermeasures.
Felix Günther, Douglas Stebila, et al.
CCS 2024
Pankaj Dayama, Arpita Patra, et al.
PETS 2022
Ehud Aharoni, Nir Drucker, et al.
CCS 2023
Michel Abdalla, Björn M. Haase, et al.
AsiaCrypt 2021