https://github.com/h3xx/jphs

jphide & seek steganography tools
https://github.com/h3xx/jphs

steganography

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jphide & seek steganography tools

• Host: GitHub
• URL: https://github.com/h3xx/jphs
• Owner: h3xx
• License: gpl-3.0
• Archived: true
• Created: 2012-02-03T17:42:35.000Z (almost 13 years ago)
• Default Branch: master
• Last Pushed: 2017-11-22T02:40:33.000Z (almost 7 years ago)
• Last Synced: 2024-08-01T15:03:49.951Z (3 months ago)
• Topics: steganography
• Language: C
• Homepage:
• Size: 994 KB
• Stars: 77
• Watchers: 7
• Forks: 23
• Open Issues: 3
• Metadata Files:
  • Readme: README.hide-and-seek
  • License: COPYING

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README

        
                 *** D A N G E R O U S ***

                 *** M U N I T I O N S *** 

These programs make use of strong encryption technology. 

Possession, import or export may be illegal in your country.

They are licenced under GPL and you use them at your own risk.

Hide and Seek for Linux

These two programs let you hide a file in a jpeg file and then

let you recover it later.

There are many similar programs but "jphide" and "jpseek" have

a big advantage over any others I have seen. They distribute the

hidden file in the jpeg so that not only are the visual effects

minimized but also the statistical effects. Simple programs which

store the hidden file in low order bits result in jpeg files which

are so statistically different from normal jpeg files that the

hidden file can be recovered with ease.

"jphide" uses the Blowfish algorithm to provide a stream of

pseudo random control bits which determine where to store the

bits of the hidden file. The program asks for a pass phrase to

initialize this stream. Although the hidden file is "encrypted"

by this process I strongly recommend that you encrypt the hidden

file before insertion into the jpeg.

Using jpeg files of about 200Kb, up to 20Kb can be inserted with

minimal visual and statistical effect. Up to about 35Kb is often

possible at the cost of visual and/or statistical effects. The 

program will refuse to insert even more because it is just too

obvious in the resulting jpeg file.

Note that if the original jpeg file is available then a hidden

file can always be detected (but it cannot be extracted without

the pass phrase). Always use originals that you have scanned

yourself and destroy the original afterwards. A reasonable

alternative if you have access to very high quality jpegs is to

make a cropped and lower quality version of about 200 to 300Kb;

again this must be destroyed after making the jpeg containing

the hidden file.

 

Instructions

jphide  input-jpeg-file  output-jpeg-file  file-to-be-hidden

jpseek  input-jpeg-file  output-hidden-file

Building the programs

Just type make.

Install "jphide" and "jpseek" in your /usr/local/bin or wherever.

Conclusion

This pair of programs offers you the ability to hide a file in such a

way that you can later deny that the resulting jpeg contains a hidden

file. Always use original scans and destroy them afterwards. Do not

try to hide more than about 10% of the file. If you are paranoid you

can keep jphide and jpseek on a floppy and be prepared to physically

destroy it. It is then even more difficult to prove that you have 

anything other than normal jpegs.

If you decide to improve these programs please make the results

public domain and post them so that others can enjoy them. The security

of your own hidden files does not depend on keeping your modifications

secret.

Revision 0.3  Allan Latham 

Revised 2012/02/03 by Dan Church