Publication

SILBE: An Updatable Public Key Encryption Scheme from Lollipop Attacks

Serge Vaudenay, Tako Boris Fouotsa, Max Jackson Samuel Sydney William Leslie Duparc
2025

Abstract

We present a new post-quantum Public Key Encryption scheme (PKE) named Supersingular Isogeny Lollipop Based Encryption or SILBE. SILBE is obtained by leveraging the generalized lollipop attack of Castryck and Vercauteren on the M-SIDH Key exchange by Fouotsa, Moriya and Petit. Doing so, we can in fact make of SILBE a post-quantum secure Updatable Public Key Encryption scheme (UPKE). SILBE is the first isogeny-based UPKE which is not based on group actions. In its core, SILBE extensively uses both the Deuring Correspondence and Kani’s Lemma, two central concepts in Isogeny-Based Cryptography.

Official source

https://infoscience.epfl.ch/entities/publication/c5c41ec3-c3a5-4c56-8f23-e9836995b514

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SILBE: An Updatable Public Key Encryption Scheme from Lollipop Attacks

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