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Revisiting the Slot-to-Coefficient Transformation for BGV and BFV
Feb. 5, 2024, 2 a.m. |
IACR News www.iacr.org
ePrint Report: Revisiting the Slot-to-Coefficient Transformation for BGV and BFV
Robin Geelen
Numerous algorithms in homomorphic encryption require an operation that moves the slots of a ciphertext to the coefficients of a different ciphertext. We describe an FFT-like method for decomposing this slot-to-coefficient transformation (and its inverse) for BGV and BFV. The proposed method is specific to power-of-two cyclotomic rings and can handle both fully and sparsely packed slots. Previously, such a method was only known for non-power-of-two cyclotomic rings. …
algorithms bfv ciphertext encryption eprint report homomorphic encryption report robin transformation
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