New SIDH Countermeasures for a More Efficient Key Exchange

ePrint Report: New SIDH Countermeasures for a More Efficient Key Exchange

Andrea Basso, Tako Boris Fouotsa

The Supersingular Isogeny Diffie-Hellman (SIDH) protocol has been the main and most efficient isogeny-based encryption protocol, until a series of breakthroughs led to a polynomial-time key-recovery attack. While some countermeasures have been proposed, the resulting schemes are significantly slower and larger than the original SIDH.


In this work, we propose a new countermeasure technique that leads to significantly more efficient and compact protocols. To …

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