Hide information in grapfic controller memory

I think that this really depends on your definition of "hide". You can read and write arbritary data to graphics memory - Google for CUDA and GPGPU for more information.

( Addition Clearly you can write to graphics memory anyway, otherwise the screen would be blank … But graphics routines aren't so useful for getting stuff back again … )

Further to Azrael's post, what is the duration of your definition of "hide"? Graphics card 'memory' is *mostly* RAM, and data 'hidden' there will obviously be lost when the machine is powered down. There is an amount of Flashable ROM on graphics cards, of course, but I believe that would be well beyond the realm of CUDA and GPGPU SDKs.

Old graphics cards didn't support getting data back out of memory very well. Now with the popularity of screen-recording software and the need for two-way memory transfers for GPGPU, it's more common for there to be proper read support.

There's little or no nonvolatile storage on a graphics card, but there's plenty of volatile storage that can be easily accessed. However, in order to do anything but computation (e.g., to send data across the network), the data must be copied off of the card's memory into the computer's memory. So that is only marginally effective hiding.

Thanks guys.
Now I have some more information to proceed.

But I agree with you, Indore that there is not a suitable place to hide data and there are certainly other place on the computer hardware that you can hide data better o efficient.

Thanks again!