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  3. how do you check the quality of your obfuscation of a .net assembly?

how do you check the quality of your obfuscation of a .net assembly?

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  • K kmoorevs

    :laugh: I was thinking the same thing! BTW, a few hours ago I checked in here and found the lounge completely empty! No messages, nothing...no soapbox, no hall of shame weird and wonderful...QA, though was still working though. I had started to wonder if we were just starting over or something. Oh well, good to see all is back to normal. :omg: ...or maybe it was just me? :confused:

    "Go forth into the source" - Neal Morse

    B Offline
    B Offline
    Brisingr Aerowing
    wrote on last edited by
    #9

    The site had a critical system error, causing all sorts of grief for people (I couldn't log in, and the forgot password Captcha didn't work at all. I contacted Chris, and he mentioned the issue).

    What do you get when you cross a joke with a rhetorical question? --- The metaphorical solid rear-end expulsions have impacted the metaphorical motorized bladed rotating air movement mechanism. --- Do questions with multiple question marks annoy you???

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    • K kmoorevs

      :laugh: I was thinking the same thing! BTW, a few hours ago I checked in here and found the lounge completely empty! No messages, nothing...no soapbox, no hall of shame weird and wonderful...QA, though was still working though. I had started to wonder if we were just starting over or something. Oh well, good to see all is back to normal. :omg: ...or maybe it was just me? :confused:

      "Go forth into the source" - Neal Morse

      S Offline
      S Offline
      Slacker007
      wrote on last edited by
      #10

      kmoorevs wrote:

      BTW, a few hours ago I checked in here and found the lounge completely empty!

      Saturday? A lot of us here don't post during the day on the weekends, I'm guessing.

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      • S Southmountain

        my assembly is .NET user control in C#. after I obfuscate it, I want to check how good is the obfuscation. So I used Red-gate Reflector to check class, method etc. What is your way to check the quality of obfuscation of a .net assembly?

        diligent hands rule....

        M Offline
        M Offline
        Mark_Wallace
        wrote on last edited by
        #11

        Just use Java. Its objectfuscation makes it impenetrable to even the most valiant code-breakers.

        I wanna be a eunuchs developer! Pass me a bread knife!

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        • K kmoorevs

          :laugh: I was thinking the same thing! BTW, a few hours ago I checked in here and found the lounge completely empty! No messages, nothing...no soapbox, no hall of shame weird and wonderful...QA, though was still working though. I had started to wonder if we were just starting over or something. Oh well, good to see all is back to normal. :omg: ...or maybe it was just me? :confused:

          "Go forth into the source" - Neal Morse

          Sander RosselS Offline
          Sander RosselS Offline
          Sander Rossel
          wrote on last edited by
          #12

          kmoorevs wrote:

          the lounge completely empty

          I figure, there is no lounge :laugh:

          kmoorevs wrote:

          no soapbox, no hall of shame weird and wonderful...QA

          What do you mean? They're not real...

          kmoorevs wrote:

          good to see all is back to normal

          Alright, this has gone on long enough. There is no lounge, no QA, no CodeProject... They're all figments of your imagination. What you experienced was one of your brighter moments where you almost realized you live in a fantasy world and was about to snap out of it :sigh: We're increasing your therapy.

          Visit my blog at Sander's bits - Writing the code you need. Or read my articles at my CodeProject profile.

          Simplicity is prerequisite for reliability. — Edsger W. Dijkstra

          Regards, Sander

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          • S Southmountain

            my assembly is .NET user control in C#. after I obfuscate it, I want to check how good is the obfuscation. So I used Red-gate Reflector to check class, method etc. What is your way to check the quality of obfuscation of a .net assembly?

            diligent hands rule....

            F Offline
            F Offline
            Fabio Franco
            wrote on last edited by
            #13

            I once used an obfuscator that prevented both ILDasm and Reflector from even opening the assemblies. It removed the headers. I'm not sure how it got to bind the assemblies without the headers, but I think it would go further on making it harder to unobfuscate the assemblies.

            To alcohol! The cause of, and solution to, all of life's problems - Homer Simpson ---- Our heads are round so our thoughts can change direction - Francis Picabia

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            • S Southmountain

              great info. thanks a million. could you name a few stand-alone deobfuscators?

              diligent hands rule....

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              N Offline
              Nelson Kosta Souto
              wrote on last edited by
              #14

              Try also this... http://ilspy.net/[^]

              NKS

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              • N Nelson Kosta Souto

                Try also this... http://ilspy.net/[^]

                NKS

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                T Offline
                thewazz
                wrote on last edited by
                #15

                i think that's a viewer, not a deobfuscator.

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                • S Southmountain

                  my assembly is .NET user control in C#. after I obfuscate it, I want to check how good is the obfuscation. So I used Red-gate Reflector to check class, method etc. What is your way to check the quality of obfuscation of a .net assembly?

                  diligent hands rule....

                  C Offline
                  C Offline
                  Chris Jacobi
                  wrote on last edited by
                  #16

                  It feels funny to me to obfuscate a user control. What is there to keep secret? Usually people obfuscate important algorithms. Admitted, to break an obfuscation, an attacker will try to start fooling around with user controls and see what modifications that does to the execution of the application. People with need for strong obfuscations normally do not obfuscate byte code languages. These have a tendency to be easy to de-obfuscate. Strong obfuscations are done on machine code programs. I'm doing obfuscations for business. Like the original poster I would love to know the quality of obfuscations. I bet my obfuscations are unbreakable by amateurs. But how can you find out security against sophisticated attackers? The solution is to pay a readteam. However,for my startup, I would not have the slightest idea where to take the money from. Maybe somebody might try it as a challenge or a crackme, just for bragging rights. But then. if somebody posts an opinion, how much would you believe it? Chris Chris Jacobi Founder White Hawk Software www.whitehawksoftware.com

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                  • S Southmountain

                    my assembly is .NET user control in C#. after I obfuscate it, I want to check how good is the obfuscation. So I used Red-gate Reflector to check class, method etc. What is your way to check the quality of obfuscation of a .net assembly?

                    diligent hands rule....

                    T Offline
                    T Offline
                    thund3rstruck
                    wrote on last edited by
                    #17

                    I open the binaries in ILSpy and if ILSpy doesn't throw an exception then the obfuscation is not good enough

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                    • F Fabio Franco

                      I once used an obfuscator that prevented both ILDasm and Reflector from even opening the assemblies. It removed the headers. I'm not sure how it got to bind the assemblies without the headers, but I think it would go further on making it harder to unobfuscate the assemblies.

                      To alcohol! The cause of, and solution to, all of life's problems - Homer Simpson ---- Our heads are round so our thoughts can change direction - Francis Picabia

                      L Offline
                      L Offline
                      Lost User
                      wrote on last edited by
                      #18

                      Hopefully it really did that and didn't just slap [SuppressIldasmAttribute] on everything..

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                      • T thewazz

                        i think that's a viewer, not a deobfuscator.

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                        N Offline
                        Nelson Kosta Souto
                        wrote on last edited by
                        #19

                        ILSpy is the open-source .NET assembly browser and decompiler. If you have a c# DLL File or EXE, you can save decompiled assembly as .csproj and Assembly as C# Project.

                        NKS

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                        • S Sascha Lefevre

                          From what I've read, de4dot[^] is probably the top dog deobfuscator or at least among them.

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                          S Offline
                          Southmountain
                          wrote on last edited by
                          #20

                          thanks. it is great tool.

                          diligent hands rule....

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                          • N Nelson Kosta Souto

                            ILSpy is the open-source .NET assembly browser and decompiler. If you have a c# DLL File or EXE, you can save decompiled assembly as .csproj and Assembly as C# Project.

                            NKS

                            S Offline
                            S Offline
                            Southmountain
                            wrote on last edited by
                            #21

                            I am using it right now besides some others..

                            diligent hands rule....

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                            • C Chris Jacobi

                              It feels funny to me to obfuscate a user control. What is there to keep secret? Usually people obfuscate important algorithms. Admitted, to break an obfuscation, an attacker will try to start fooling around with user controls and see what modifications that does to the execution of the application. People with need for strong obfuscations normally do not obfuscate byte code languages. These have a tendency to be easy to de-obfuscate. Strong obfuscations are done on machine code programs. I'm doing obfuscations for business. Like the original poster I would love to know the quality of obfuscations. I bet my obfuscations are unbreakable by amateurs. But how can you find out security against sophisticated attackers? The solution is to pay a readteam. However,for my startup, I would not have the slightest idea where to take the money from. Maybe somebody might try it as a challenge or a crackme, just for bragging rights. But then. if somebody posts an opinion, how much would you believe it? Chris Chris Jacobi Founder White Hawk Software www.whitehawksoftware.com

                              S Offline
                              S Offline
                              Southmountain
                              wrote on last edited by
                              #22

                              inside my user control I do have some algorithms to protect. I checked your website, but not see product yet...

                              diligent hands rule....

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                              • S Southmountain

                                thanks. it is great tool.

                                diligent hands rule....

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                                S Offline
                                Sascha Lefevre
                                wrote on last edited by
                                #23

                                glad I could help!

                                1 Reply Last reply
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                                • S Southmountain

                                  my assembly is .NET user control in C#. after I obfuscate it, I want to check how good is the obfuscation. So I used Red-gate Reflector to check class, method etc. What is your way to check the quality of obfuscation of a .net assembly?

                                  diligent hands rule....

                                  G Offline
                                  G Offline
                                  Ganesh R Rao
                                  wrote on last edited by
                                  #24

                                  See if this tool can de-obfuscate your obfuscation: http://de4dot.com/[^]

                                  1 Reply Last reply
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