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[Enhancement] The encoder in CKKS is required for the IsNTT checking. #501

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@hm-choi

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@hm-choi

Hello, I'm using Lattigo V6 to design a privacy-preserving machine-learning architecture. I used the coefficient encoding without NTT mode. However, the CKKS Encoder automatically conducts the NTT operation.
image

line 163 in lattigo/schemes/ckks/encoder.go

I suggest that the statement checking code before conducting the NTT operation as follows
image

Thanks

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