Relations among new CCA security notions for approximate FHE

ePrint Report: Relations among new CCA security notions for approximate FHE

Sébastien Canard, Caroline Fontaine, Duong Hieu Phan, David Pointcheval, Marc Renard, Renaud Sirdey

In a recent Eurocrypt'24 paper, Manulis and Nguyen have proposed a new CCA security notion, vCCA, and associated construction blueprints to leverage both CPA-secure and correct FHE beyond the CCA1 security barrier. However, because their approach is only valid under the correctness assumption, it leaves a large part of the FHE spectrum uncovered as many FHE …

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