Hi guys, I got a question regarding the rotation in BFV. Suppose we have a ciphertext with 8192 slots encrypted using BFV, e.g., C = Enc([1, 2, 3, 4, …, 8192]). Then we rotate this ciphertext for 1 step and get C’ = EvalRotate(C, 1). I wanted to get C’ = Enc([8192, 1, 2, 3, 4, …, 8191]) but I not…

Rotation in BFV

ypolyakov March 18, 2023, 1:51am 4

If N is the ring dimension, rotating the vector by N/2 should swap the batches (rows).

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Rotation of ciphertexts on column-basis

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