[dundee] EthHack: GCHQ challenges codebreakers via social networks

[Nicholas Walker]

I'm actually madbro. Turns out the binary is built for an imaginary
architecture built by them. Missed a hint, there's some stego in the
original image. I found the last page through a complete fluke. Its
"/soyoudidit.asp". Not happy until I've run this through their
"architecture" though.
On Dec 1, 2011 2:34 PM, "Robert Ladyman" <it at file-away.co.uk> wrote:

> The 00 01 00 00 and the nops give it away quite quickly, don't they.
>
>
> > Got as far as the raw binary for a 16 bit DOS executable. Running it
> > produces no output, the ASM seems to null registers using an XOR and then
> > do some comparisons against various states. There's also some iteration
> > against the stack pointer, which seems to move the stack frame by 65036
> > every iteration. Strange, but I'm getting somewhere.
> >
> > On Dec 1, 2011 11:23 AM, "Robert Ladyman" <it at file-away.co.uk> wrote:
> > > > http://www.bbc.co.uk/news/technology-15968878
> > >
> > > ...and if anyone needs a clue, they can ask me.
> > >
> > >
>
> --
> Robert Ladyman
> File-Away Limited
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>
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