Steganography

Steg Guess

Most people when hearing about digital Steganography want to see if it is possible to tell if an image is a Steganographied image just by viewing.

In most cases digital image Steganography is imperceptible to the human eye at a standard resolution, if an encoding algorithm tries to change the data by a small amount. Generally the change in data is between 0 and 3 of the pixel value, the pixel value itself has a range of 256 values, so we are looking at an approx 1% (1.18% is the max) change in any given pixel.

Still, it is interesting to see if it is possible, so if JavaScript is enabled in your browser you should see, or shortly see, a Steganography guessing game below.

Steg Guessing Game

Conclusion

Unless you have remarkable eyesight the average score will be about 3 out of 12. If you are getting 10 - 12 out of 12 over a few tries then you have incredibly good eyesight, unless of course you're cheating :).

By checking the properties of the image you would be able to see what it is by description.

The images have been Steg'd with the code of the Source Code library. I just added an encoding algorithm loop, and changed the key to 'n'.

The steg'd messages are not long, so the top left is where you would see a difference.

Some of the images are weak, some are deceptively strong. Most would be flagged as possible steg images in either the cover or steg state. But, quite a few have artistic merit as well.

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