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Asked: 2026-05-10T13:42:47+00:00

I’ve written (most of) an application in Flex and I am concerned with protecting

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I’ve written (most of) an application in Flex and I am concerned with protecting the source code. I fired up a demo of Trillix swf decompiler and opened up the swf file that was installed to my Program Files directory. I saw that all of the actionscript packages I wrote were there. I’m not too concerned with the packages, even though there is a substantial amount of code, because it still seems pretty unusable without the mxml files. I think they are converted to actionscript, or atleast I hope. However, I would still like to explore obfuscation.

Does anyone have any experience with Flash / Actionscript 3 / Flex obfuscators? Can you recommend a good product?

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  1. Here’s what I would do.

    • Compile your application to a SWF file. Then encrypt the SWF using AES.

    • Make a ‘wrapper’ application that loads the encrypted SWF into a ByteArray using URLLoader

    • Use the as3crypto library to decrypt the swf at runtime.

    • Once decrypted, use Loader.loadBytes to load the decrypted swf into the wrapper application.

    This will make it a lot harder to get your code. Not impossible, but harder.

    For AIR applications you could leave the SWF encrypted when delivering the application to the end-user. Then you could provide a registration key that contains the key used to decrypt the SWF.

    Also, here is a link to an AS3 obfuscator. I am not sure how well it works though. http://www.ambiera.com/irrfuscator/index.html

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