FESTA: Fast Encryption from Supersingular Torsion Attacks

ePrint Report: FESTA: Fast Encryption from Supersingular Torsion Attacks

Andrea Basso, Luciano Maino, Giacomo Pope

We introduce FESTA, an efficient isogeny-based public-key encryption (PKE) protocol based on a constructive application of the SIDH attacks.
At its core, FESTA is based on a novel trapdoor function, which uses an improved version of the techniques proposed in the SIDH attacks to develop a trapdoor mechanism. Using standard transformations, we construct an efficient PKE that is IND-CCA secure in the QROM. Additionally, using …

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