The primary purpose of salting is to prevent precomputation being used to attack all users (e.g. rainbow tables). Even when specific salts are known they have already done this job.
Salts are not intended to be secrets.
If you want to treat a salt as if it was a private key, that would only provide additional protection for the very specific circumstance where the user hash is compromised, but the corresponding salt was not.
Salts are not intended to be secrets.
If you want to treat a salt as if it was a private key, that would only provide additional protection for the very specific circumstance where the user hash is compromised, but the corresponding salt was not.