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Does it make sense to run a encryption key (2048 bit) generated with the RNGCryptoServiceProvider through Rfc2898DeriveBytes.GetBytes() or is Rfc2898DeriveBytes more geared toward generating encryption keys from shorter keys like passphrases?
If you already have something suitable for a key, which it appears you have, why would you use it to generate another key? Personally I don’t see any benefit putting it through derived bytes as you already have a cryptographically secure random number.