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This is a client-side Javascript tool to steganographically hide images inside the lower 'bits' of other images.

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Select either 'Hide image' or 'Unhide image'. Play with the example images (all 200x200 px) to get a feel for it.

Performs statistical tests to find if a stego tool was used (jsteg, outguess, jphide, ). Check out man stegdetect for details. Stegdetect stego.jpg: stegbreak: Images (JPG) Brute force cracker for JPG images. Claims it can crack outguess, jphide and jsteg. Stegbreak -t o -f wordlist.txt stego.jpg, use -t o for outguess, -t p for jphide or -t. $ outguess -d examplefile.txt image.jpg image-output.jpg The “image-output.jpg” file is the one on which your confidential file will be embedded. In case you want to specify a secret key that will be used while extracting the file after it has been embedded, use the following syntax. To install Outguess. Open Terminal Window Login as Super User using the bash command „su‟ and then enter the „password‟. Change the present working directory to the location where the outguess tar.gz file is located. Now extract the file using the command „tar –xvzf filename‟. This paper shows how neural networks are able to detect steganography content coded by a program OutGuess and Steghide using neural networks like taxonomist. And then decode the coded messages. Online steganography service, hide message or file inside an image: Steganography is the practice of hiding secret information inside a cover file (such as a picture) where nobody would suspect it contains hidden information inside of it. The secret information.

Each channel (red, green, blue) of each pixel in an image is represented by an 8-bit value. To hide the secret image inside the cover image, we replace the n least significant bits of the cover pixel value with the same number of most significant bits from the secret pixel value. Example, using 3 hidden bits:

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2013 nissan sentra transmission recall. Cover pixel: (167, 93, 27) (10100111, 01011101, 00011011)
Secret pixel: (67, 200, 105) (01000011, 11001000, 01101001)
Output pixel: (162, 94, 27) (10100010, 01011110, 00011011)

The output colour is almost indistinguishable from the cover colour, but now contains information to extract an approximation of the secret pixel value, which gets padded with 0 to fill in the missing bits, so comes out to (64, 192, 96) (01000000, 11000000, 01100000) .

Using a larger number of hidden bits results in a better quality hidden image, but makes it easier to tell that the hidden image is there. Play with the 'hidden bits' slider to see.

There is an example on Wikipedia of a cat hidden in a picture of a tree. To do the example here, use the 'Unhide image' tool to select the 'Wikipedia tree' example, and set hidden bits to 2.

All of the computation is performed in your browser in Javascript. Be careful with larger images as it can be quite slow.

Once you've hidden your secret image inside a cover image, send the output image to your accomplice. Your accomplice then uses the 'Unhide image' tool to recover the secret image.

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Hidden bits: 1
Outguess decode online
Hidden bits: 1

This is a project by James Stanley.

Online

You can learn more about Steganography on Wikipedia.


Image steganography is the art of hiding messages in an image.

This is a great way to send a secret message to a friend without drawing attention to it. Compare this method to simply sending someone an encrypted piece of text. No matter how strong the encryption method is, If someone is monitoring the communication, they'll find it highly suspicious.

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Look at some nice example ‘Stegafiles’ to get an idea!

Link to this page: “Steganography”

You can link to this tool using this HTML code. Simply copy and paste it into your page:

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If you have any problems using this Steganography (encode text into image), please contact me.