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Office 2007 SP2 Encryption Settings
Now that we've actually shipped SP2, some of you may be curious about how to use the shiny new encryption. Here's the registry settings: Registry keys Base keys (also corresponding Policy keys) HKCU\Software\Microsoft\Office\12.0\<appname>\Security\Crypto Read More...
Posted 20 May 09 08:41 by david_leblanc | 1 Comments   
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Legacy RC4 Example on Codeplex
Just a quick note on this – a customer had a question about the old RC4 40-bit encryption yesterday, and this prodded me into taking some memory dumps of intermediate steps and figuring out where my own example code wasn't working. Fortunately, it wasn't Read More...
Posted 06 February 09 01:52 by david_leblanc | 2 Comments   
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MS-Offcrypto Example Update
Just a quick note that I've updated the examples. I added an example for the CAPI RC4 encryption that does work. Along the way, I got smarter about managed C++ and C# interop, which turned out to be a bit of an adventure. I didn't find the documentation Read More...
Posted 13 January 09 12:41 by david_leblanc | 0 Comments   
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MS-Offcrypto Examples
In response to some questions I've gotten about details of MS-OFFCRYPTO, I've created a CodePlex project to contain sample code demonstrating the documentation. You can find it at http://www.codeplex.com/offcrypto . I had originally wanted to include Read More...
Posted 06 January 09 01:30 by david_leblanc | 1 Comments   
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Office Crypto KDF Details
I've gotten a couple of questions asking how our key derivation function works. The technique is very similar to that described in RFC 2898, also known as PKCS #5. There are two key derivation functions (KDF) documented in this RFC – PBKDF1 and PBKDF2. Read More...
Posted 05 December 08 03:08 by david_leblanc | 0 Comments   
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New, Improved Office Crypto
If you're enough of an Office crypto geek to stay on top of the most recent changes in MS-OFFCRYPTO, you already know about some of this, but my assumption is that most people aren't going to want to parse something that hard to read. What we're doing Read More...
Posted 04 December 08 05:39 by david_leblanc | 2 Comments   
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MS-OFFCRYPTO, W7 Engineering blog, etc
We have a new version of MS-OFFCRYPTO out. The big change is that how CryptDeriveKey was documented on MSDN was incorrect, we copied it, which made our document also incorrect. As it turns out, CryptDeriveKey always uses the same code path for AES as Read More...
Posted 16 October 08 03:10 by david_leblanc | 1 Comments   
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Office Crypto Follies
What I've been working on lately that has kept me from doing nearly anything else can be found at: http://msdn.microsoft.com/en-us/library/cc313071.aspx MS-OFFCRYPTO is very detailed documentation of exactly how we do cryptography for binary and OOXML Read More...
Posted 03 July 08 05:44 by david_leblanc | 6 Comments   
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