[HOWTO] Create a hidden loopback device in a .jpg file

Well, I’m sure that you are definitely curious about how do you do this. Let me tell you this, it’s really simple.

  • Image File(any format will do or even any file will do)
  • Linux(I’ve only tested it on this platform but I guess Mac would also do)

Let’s get started, shall we?
First create a standard loopback device.

dd if=/dev/zero of=hiddenimage bs=1M count=10

Let’s see what does this do:
It creates a file called “hiddenimage”, with it’s size as 10MB.
Then, create a filesystem on it.

mkfs.ext4 hiddenimage

mke2fs 1.41.8 (11-July-2009) hiddenimage is not a block special device. Proceed anyway? (y,n) y Filesystem label= OS type: Linux Block size=1024 (log=0) Fragment size=1024 (log=0) 2560 inodes, 10240 blocks 512 blocks (5.00%) reserved for the super user First data block=1 Maximum filesystem blocks=10485760 2 block groups 8192 blocks per group, 8192 fragments per group 1280 inodes per group Superblock backups stored on blocks: 8193 Writing inode tables: done Creating journal (1024 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 39 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override.

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Simple Steganography

Wanna hide that information and private things you don’t want your buddies to see? Here is what is called simple steganography. Steganography is the master of black arts. Nobody can ever suspect that there is a simple, easy-to-find drawer in one of your pictures. This works with .png files as I didn’t try it with any other. If the trick works on other file types, please let me know. All set to go? You need a GNU/Linux terminal or a Mac terminal to do this. Someone please post ways of doing this in Windows!
The Trick:
We have a file called “Secret Song.mp3”. We want to hide this into an image file. Let’s assume that our image file is called “Landscape.png”. First, compress the “Secret Song.mp3” into the .zip type compression. Then type the following in the shell:
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