Separate security for both of two distinct parties - 1 the data owner - 2 the application owner

I have written a web application in .net that runs on a shared server using Sql Server 2012. My program is only useful if I partner with certain data owners. I need to protect my program; they need to protect their data. I am assuming they at least run Sql
Server 2008 R2. I need to interface with their database using a couple of stored procedures. I want these procedures to only be available to my application, and I want the processes and output of the stored procedures to be apparent to me and to my application
alone. I assume they want their data to only be available to my application, not to me generally. This application needs to be available from my website, as well as from their website. I realize this question touches on areas outside of Sql Server Security
as it reaches into basic architecture as well. Any help or pointers to help would be greatly appreciated.
Thank you,

That article discusses the situation in a single instance of SQL Server and is in no way applicable to a scenario where you want to set up trust between a web server and an SQL Server instance.
There is one thing you can do with certificate, that possibly may be appliable to your situation. Say that you develop the stored procedures at your site, and then deploy them at the other site. You want to make sure that the procedures are not modified
locally. To this end yon can sign the stored procedure with a certificate locally. When you ship the procedures, you also ship the public key of the certificate, and in the install script you use ADD SIGNATURE WITH BLOB to sign them. You take that blob from
your home system.
Your web application can then repeatedly check that the procedures are signed with the correct signature. It the procedure is changed locally, the signature is lost. They can re-sign it locally, but not with the certificate you shipped.
This does not prevent other users from calling the stored procedures or look at the code. For that you need trust and contracts between humans.
Erland Sommarskog, SQL Server MVP, [email protected]

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