How to check the noise budget?

[fedejinich]

Hi, how can I get the remaining noise budget of a ciphertext? I want to see the way noise grows during the execution, and I want to check how much noise is left until I corrupt the ciphertext. Is there any util for that?
Thanks

[Pro7ech]

Hi @fedejinich, I believe you are referring to the BFV/BGV schemes. The only way to check the noise budget is to decrypt and check the norm of the error. See the tests in the BFV/BGV schemes on how to do it:

lattigo/schemes/bgv/bgv_test.go

Line 159 in edde68e

if *flagPrintNoise {

[fedejinich]

thanks!