The main purpose of obfuscation is to hide tell tale program information from being easily read and understood by the human eye. This is quite a difficult task when there are tools such as Reflector and ILDASM sitting around that allow you to easily break apart an assembly and investigate its internals. Many obfuscators these days attempt to thwart this by stopping ILDASM and Reflector decompilation via some simple techniques that we'll go into detail over the next few posts. Some of the techniques are questionable as we'll soon see; however some of them are also quite legitimate but weak. This week we'll take a look at a simple technique to stop ILDASM decompilation, and also how to get around it.