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RNGCryptoServiceProvider and Rfc2898DeriveBytes

Whether it makes sense to run the encryption key (2048 bits) generated via RNGCryptoServiceProviderthrough Rfc2898DeriveBytes.GetBytes()or Rfc2898DeriveBytes, more focused on the creation of the encryption key from a short key, such as the phrase:

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If you already have something suitable for the key that you have, why are you using it to create another key? Personally, I see no benefit by embedding it in derived bytes, since you already have a cryptographically secure random number.

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Rfc2898DeriveBytes.GetBytes() . , , (, , ). (, ), Rfc2898DeriveBytes ( ).

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