For the BizTalk solution deployment, strong key is required. For this purpose you have to create on. Open visual studio Command prompt, on my machine I have install visual studio 2008. I found from here.
Open it as administer option. Write the following command at command prompt.
sn –k <file name>
for my case I generate the test.snk.
snk –k c:test.snk
You can copy this file in your BizTalk solution and used it in your application.
For detail information visit at following link:
http://msdn.microsoft.com/en-us/library/6f05ezxy%28v=vs.71%29.aspx