Connection String Encryption For SQL Server Mobile

I'm seeking suggestions on how to go about encrypting a database connection string in the compact framework. It's something that I thought would be relatively straight forward as I've accomplished it without much difficulty in the full framework, but I'm stuggling to find a solution.

I've been trying to implement a solution using public/private key asymmetric encryption using the RSA provider. I've essentially been trying to encrypt the connection string once on my development machine so that I can include both the encrypted connection string value and public key in either code or an external file. I'd then keep the private key out of harms reach. The problem I've encountered in doing this is that that RSA provider seemingly only allows new "in session" keys to be generated and I can't figure out a way of importing a public key from a file or other similar means.

I found the following code which is meant to allow a key to be retrieved from a signed assembly or an SNK file, which I've converted to VB but haven't been able to get working:

http://www.topxml.com/-NET-XML-System-XML/re-2963_Get-RSA-Public-key-from-Assembly-or-SNK-File.aspx

After the code seems to successfully prepare the CspParameters from an SNK files, I get an unspecified error when executing ImportParameters on the RSA provider.

I'd imagine this to be a common requirement, but haven't been able to find much information specific to the compact framework on the web. Any guidance would be much appreciated.

Thanks,
Steve