Hello everyone,
I have 2 questions.
I’m trying to achieve 128-bit security for my purposes, and I’ve fixed HEstd_128 classic. However, whenever I execute my program with any ring dimension, I get this error message. Could it be that there are cases where a certain security level can be achieved solely through a single ring dimension? Since runtime with 131k would take too long, I wanted to know for research purposes if it’s possible to somehow estimate the precision of a calculation.
terminate called after throwing an instance of 'lbcrypto::OpenFHEException'
what(): /home/openfhe-development/src/pke/lib/scheme/ckksrns/ckksrns-parametergeneration.cpp:l.105:ParamsGenCKKSRNS(): The specified ring dimension (1024) does not comply with HE standards recommendation (131072).
Question 2:
Is it possible to make a general statement regarding the ring dimension and the associated precision? Sometimes, when increasing the ring dimension, I get worse results than with lower ones. I know that increasing the scaleModSize improves precision, but how is precision related to the ring dimension? I would be very grateful for an answer.