Default Salt Use

See here: https://github.com/JaCraig/Craig-s-Utility-Library/blob/master/Utilities/IO/Encryption/BaseClasses/SymmetricBase.cs#L140

This code supplies a default salt of Kosher - this use defeats the purpose. Please here here for a detailed discussion of how salts should be applied - the key point is that to be effective, they should be random. Relying on a fixed or default salt defeats the purpose.

I would suggest removing the default, and add a method to generate a random salt using a CSPRNG.