back in the days, i remember playing around with those swf's... IIRC, there used to be tools to decompile them and look at the sourcecode? Maybe you can find a hint therein?
We took the .swf apart and nothing to say about it. But would be very interested in any standard tools which may have been around in 2010?? tools to translate an imagefile and a 32bit hex word into a privkey
