CKKS security estimation for Palisade My question is rather practical and specific. I am trying to setup an efficient CKKS scheme in Palisade. To this end, the automatic choice for secure parameters has to be turned off and I rely on the LWE estimator which estimates the security of an LWE instance. Now, the estimator provides a security estimation for an LWE instance $\mathrm{LWE}(n,\alpha,q)$, where $n$ is the dimension/ring dimension, $\alpha$ depends on error distribution, and $q$ is the ciphertext modulus. However, in Palisade there seems to be no possibility to setup the error in CKKS (this is easily possible in BGV). This way, $\alpha$ remains unknown and the security can not be estimated.
Therefore, how is the error chosen in Palisade for CKKS and how can this value be accessed?
In PALISADE, CKKS is configured to use $\alpha = 8/q$ (using the definition of $\alpha$ in the LWE estimator). This corresponds to the standard deviation of $8/\sqrt{2\pi} \approx 3.19$. This value was chosen based on the HE security standard at https://homomorphicencryption.org/standard/
You can manually change this value from 3.19 to something else by modifying $\textbf{genCryptoContextCKKS}$ in https://gitlab.com/palisade/palisade-release/-/blob/master/src/pke/lib/cryptocontextfactory.cpp