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Sergey Barskiy posted the code for a solution allowing encryption in a Silverlight client.

Today I would like to cover a specific use case that came up a few times in Silverlight applications I wrote.  For example, I wand a user to enter some sensitive information, encrypt it in Silverlight client, transfer it over to the server, then decrypt it and perforation some operations on that data.

First step of course is to find sufficiently strong encryption protocol that can be implemented in both Silverlight and .NET and be completely compatible between both run times.  I am going to go for AES encryption.  AES stands for “Advanced Encryption Standard”.  This standard is widely used and approved by US government and standard bodies.  See this article for details.

In my last post I am going to cover the last two topics I set out to address.  The first topic is UI testing.  What unit test frameworks lack sometime is the actually UI testing.  What I mean by that is for example, click on a button, then see what happens.  In case of Silverlight, Silverlight framework itself has a number of helper classes to help us achieve this goal.  For example, ButtonAutomationPeer class allows us to drive button actions from within unit tests.  Also, Microsoft Silverlight unit testing framework allows developers to insert UI components onto unit testing surface.

I will be using the following set of technologies. 

• Microsoft Silverlight Unit testing framework that ships with Silverlight tool kit
• Moq – mocking framework that supports Silverlight 4
• StatLight – unit testing automation framework that will allow for unattended / automated running unit tests

It supports multiple strongly typed tables, basic Linq based operations, addition and deletion of ranges of items, deletion of items based on condition.  You can also directly bind data to UI in Silverlight because base table inherits from ObservableCollection.  It supports encryption along with lazy loading of table.