Full Version: Hide stuff inside your MoI .3dm files

Hi all,

while steganography is not new and is often used to hide stuff inside
images or videos, i thought why not give a 3D model file a try.

So i took an old little .3dm file of mine and embedded an .mp3 file
which i created with macOS's say command and then run through
the lame encoder.

Maybe some of you find this interesting for inserting a hidden
copyright notice etc. in your files.

Please note: I did not extensive tests, so in case of any (file) damages
i am not responsible! It is more or less a test for me, if this could be
done.

Here is a picture of the model:



Here is the link to the .3dm file (expires in 30 days):

https://ufile.io/7gkeb

and here is the link to the software i have used. In the binaries
folder you can find compiled versions for most platforms.

https://keybase.pub/stefan_claas/software/steg/

Regards
Stefan

---

Hi Stefan,

Cool idea for a digital "watermark".

1 - Where do you find the mp3 file inside the 3dm file?

2 - I'm curious how you modeled a knife edge into the 3 blending ovals? Tried to reproduce that and I get close but with a slight bubble on the Y-axis center seam surface. Tried sweeps, blend and network using the curves in your 3dm file.

Thx.

M

---

Hi mat10x,

thanks! you will find the hidden .mp3 file when you download
the steg program from my download link and then run the
command (in a Terminal or cmd.exe):

steg show -input hidden.3dm -outputdir path/to/dir

Regarding the modeling i did that many years ago,
so i can't help that much, because i forgot the steps.

Only thing i remember is that i used also ViaCAD
for this model to get the proper N-Sided Surface
at the tail.

Regards
Stefan

---