Re: Size of Entropy with Dpapi Encrypted Connection String

From: Alek Davis (alek_xDOTx_davis_xATx_intel_xDOTx_com)
Date: 03/15/05 

Date: Mon, 14 Mar 2005 17:24:51 -0800

This does not sound right. Entropy can be any size (well, there may be
limitations, but for practical purposes it can be just about anything). I am
not sure I follow what you're saying. You said that you are encrypting a
Rijndael (or AES) key, but than you somehow linked it with connection
string. Where did the connection string come from? What is "the connection
string entropy?" Are you talking about initialization vector (IV) used with
Rijndael key by any chance? This value must be of specific size (related to
the key/encryption block size, normally 16 bytes). Could you clarify what
exactly you are doing?

Alek

"Phil Czapla" <charlestek@rcn.com> wrote in message
news:%234O2vN3JFHA.1308@TK2MSFTNGP15.phx.gbl...
>
>
> Thanks Dominick,
>
> The reason I ask is that in the encrypting of
> the binary aes key by the dpapi, it appeared I had problems
> unless the binary entropy value was the same number of
> bytes as the key. Thus I extrapolated this to suggest that
> perhaps I'd have to count the number of characters is the connection
> string and use that as the number of bytes for the connection string
> entropy.
>
>
> Phil
>
> *** Sent via Developersdex http://www.developersdex.com ***
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