hacker.org

Posted: **Sun Feb 22, 2009 11:46 pm**

HiGH Guys!

Perhaps i'm telling you too much

- but I HAVE TO share this idea with you:

Did you ever thought about the next generation of File Sharing?

I did And thats what I invented:

A tool called "PicUp" that's taking advantage of the mass of free image hosting servers like www.imageshack.us and all the others!

The concept behind this is simple:

1. Converting any files or binary data to a collection of small bitmaps or .png files which are used as a kind of splitted container files for the desired data.

2. Uploading those encoded pictures to to one of the many (registration) free image hosting servers like www.imageshack.us or www.picoodle.com

3. (optional) use other image hosters wich support (URL based) server-to-server uploading to increase the possible download bandwith

4. Creating a single (steganophic encrypted) header PNG that contains all the direct URLs of the other data containing PNGs that you uploaded before - with all existing image mirrors.

5. Post the URL of the header image to any forum you prefer in order to allow others to download and decode these encoded images files...

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Let's come to the challenge:

Try to decode the file stored in the following image:

--> "Pic it up - and Pic it down - share your pictures all around (the world)"

Please give me some feedback...

Posted: **Tue Feb 24, 2009 6:53 pm**

58 views yet and no one decoded the image - you're dissapointing me guys...

Posted: **Tue Feb 24, 2009 9:47 pm**

i only get junk when putting the image to raw

Posted: **Tue Feb 24, 2009 9:53 pm**

Nice Idea, but if it gets too popular, imagehoster'll lock this sort of pictures.

Posted: **Wed Feb 25, 2009 12:11 am**

I agree with exby. It's far to easy to be recognized as hidden content.

From the visible structures I'd suspect you need to turn the picture by 90 degrees
before converting it to raw. Then you probably used some kind of compression
and/or encryption to garble your file(s). Decoding this without any knowledge of the
content or the algorithm will be quite hard and time consuming...
but probably fairly easy if (at least some) content is known.

Even if you use strong encryption, I guess your pictures will be banned by the image hosters
very soon.

What's your next idea?

Posted: **Wed Feb 25, 2009 12:22 am**

I've got it.

There is no encrytion algorithm or compression used. It is a kind of raw format.
Try to find out the file format of the decoded file.

@c0rt3x : I sent you a PM.

Posted: **Wed Feb 25, 2009 8:28 am**

ok, i kinda get the file now, but what's that 4 byte on the beginning?doesn look like size/crc
if i remove it it doesn't work :/

Posted: **Thu Feb 26, 2009 12:44 pm**

the size of the hidden file is at the "end" of the image. but the "header" or better let's say "footer" is encoded - but not encrypted....

Posted: **Thu Feb 26, 2009 12:52 pm**

Posted: **Thu Feb 26, 2009 2:36 pm**

about the image hosters: you should probably save the max. image size aswell. what would you take as general maximum for the fileparts? i'd say at most 2MB, maybe even randomeized between 1-2MB.

ok, i still dont get what strange format you try to use here. why not simply do <size of the data (int64?)><CRC32><data><NUL padding>

and the image dimensions maybe so that you waste the least possible amout of pixels in NUL padding.

Posted: **Thu Feb 26, 2009 4:00 pm**

The maximal image size is automatically recognized before uploading... Yes randomizing the file size and the image width and height is a good idea - i thought about that allready a few days ago - but I did'n impement it yet. But im going to realise these extra features soon. As well as an automatic up- and download speed test for at atleast these sites I posted above...

hacker.org

The next generation of FileSharing...

The next generation of FileSharing...