Code obfuscation is a process that makes your application binaries harder to read with a decompiler. The only way to reverse engineer how they work is with a disassembler, which is an arduous and complicated process. The intermediary language is similar to assembly, but it can be easily converted back into the source code. This means that if you have a public DLL or executable that your business is distributing, anyone with a copy of your executable can open it up in a. NET decompiler like dotPeek, and directly read and copy your source code.
What obfuscation does do is use a number of tricks to make the source code annoying as hell to read and debug. The simplest form of this is entity renaming. More advanced obfuscators can go further, and actually change the structure of your source code. This includes replacing control structures with more complicated but semantically identical syntax. The effect of this is that it makes your source look like spaghetti code, making it more annoying to read. Another common focus is hiding strings from decompilers.
In managed executables, you can search for strings like error messages to locate sections of code. String obfuscation replaces strings with encoded messages, which are decrypted at runtime, making it impossible to search for them from a decompiler. This usually comes with a performance penalty.
Microsoft has CoreRT , an experimental. See the open issues for a list of proposed features and known issues. Contributions are what make the open source community such an amazing place to be learn, inspire, and create. The Control Flow obfuscation algorithm distorts and reorders the IL code in the assembly, inserting bait branch instructions while preserving code semantics. This obfuscating essentially converts assembly method implementations into "spaghetti code", making interpretation by human hackers and decompiler tools much more difficult.
Actually Control Flow obfuscation involves the insertion of additional instructions. Applying of this feature increases the size of the output assembly. If a maximum level of code protection is not required for your assembly, you may want to consider disabling this feature to minimize your output executable code size. Control Flow obfuscation discourages reverse engineering and malicious tampering of software codes by applying false conditional statements and other misleading constructs in order to confuse and break decompilers.
Given the original source codes and desired obfuscation criteria, the proposed Control Flow obfuscation works by decomposing the source codes into fragments and then applying various transforms to the code fragments.
As the Skater? Moreover, since only Control Flows are obfuscated with a sequence of transformations that produce equivalent results of the original fragments, the final output can still preserve the same execution results as the original codes.
Let's try to write a simple command-line application and then obfuscate it. The following console programs are the VB. We have added couple of private variables to see what happen when we obfuscate them. Today is:"; private System. You can see four highlighted members' names.
Two are private variables' names today and str. Module1 is name of the class. Main is name of method that is single method in the simple class. Now we are ready to compile the simple code in. NET environment. We may get ConsoleApplication1.
What is inside in the executable? Why do people say we need to hide our. NET stuff? To decompile the ConsoleApplication1. Take a look what we got after the decompilation:. DateTime today. DateTime [Microsoft. DateTime ConsoleApplication1. StringType:: FromDate valuetype [mscorlib]System. Everything looks pretty obvious and understandable in the IL script. Is not it? Right, it is hard to figure out the IL code for us more mortals.
So if you are now guessing your. NET source code will be accessible only to a small circle of technical folks who actually know IL Assembly Language, think again. You can take this step further and actually recreate the source code by using some much sophisticated decompilers.
These decompilation tools can decompile a. Ok, we are ready to obfuscate the sample ConsoleApplication1. Open the exe file in Skater Obfuscator. Choose all Private and all Public members obfuscation mode. When you run the obfuscated ConsoleApplication1. Take a look what changed inside the simple program. NET Obfuscator. Strings values are NOT unraveled as well. NET Obfuscator, a code-protection tool for.
NET app obfuscation. The Light version is the Free edition of Skater. The protection tool has been developed to assist you protect. NET apps when sending them to your customers both commercial and personal usages. NET Obfuscator executes all popular software protection innovations and obfuscation techniques.
If you would like systematically protect your. NET software apps the Skater. NET Obfuscator is a right tool for you. Rustemsoft is running the Skater for internal needs to achieve external goals securing all Rustemsoft commercial. NET exes and dlls. NET Obfuscator was originally developed as a need for Rustemsoft struggling to efficiently get our.
NET applications through the software source code protecting process in a reasonable time. We checked lots of code securing software tools. We needed an application that was easy, simple and covered all areas of the. NET apps protection process. In the end we built Skater. NET Obfuscator that works in a way that makes sense to our customers. Main features of software protection algorithm may be defined as identification of pirate's hacking to decompile or unauthorized access to software code.
NET obfuscator runs the code protection by various means mostly focus on producing the assembly internal names inane, encrypting string values, and including bamboozling code commands. You should assign obfuscation settings for your assembly in Skater interface first.
Then the command-prompt obfuscation run will use the pre-stored settings. NET Obfuscator is efficient and easy to use. NET code protection tool that secures your. NET application from competitors, hackers, and prying eyes by protecting against unauthorized use, reverse engineering, and code tampering.
This is a. NET software Licensing and Protection tool. Skater obfuscates and protects your. NET software, optimizes your. NET assembly for better deployment, minimize distribution size, increase performance and add licensing features. Skater freeware obfuscator efficiently enables you to deliver a smart version of your. NET assembly, in no time and with unmatched ease. Private and Public members names obfuscation.
It scrambles names of classes, methods, variables, and other assembly members.
0コメント