I want to extract all MSB with an RLWE Ciphertext into an vector.I I’m not sure if exist an solution.
Does there exist a solution that can extract all MSBs from an RLWE ciphertext, like in BGV or BFV?
I am not sure I understand your question. Could you please fix the grammatical errors in both the title and question.
EvalSign (based on FHEW/TFHE) to find MSB of an LWE ciphertext. Are you asking whether such a capability exists for BGV or BFV?
If yes, then this can be achieved using BGV/BFV bootstrapping (more general case) or special polynomials. Please clarify your question so I could answer it more definitively.
Yes,My problem is that how to find MSB vector ciphertext of an RLWE ciphertext without decomposition.
The two potential solutions are:
- Logistic regression over encrypted data from fully homomorphic encryption (section 3.5)
- Faster homomorphic comparison operations for BGV and BFV
Alternatively, you use
EvalSign with scheme switching to/from FHEW/TFHE from/to BGV/BFV