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Steganography Rate Topic: ***** 9 Votes

#16 stevesmithx  Icon User is offline

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Posted 12 June 2008 - 10:50 AM

Excellent job Willliam.
Really helped me understand Steganography.

But I think the following assumption goes wrong when the message to be encoded is too long.

Quote

thought it important to explain this operation. This method could just as easily be written as:
CODE

private byte[] bit_conversion(int i)
{
return(new byte[]{0,0,0, (byte)(i & 0x000000FF));
}


Great work.
Keep it up.
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#17 William_Wilson  Icon User is offline

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Posted 23 July 2008 - 01:13 AM

This function does not check any lengths you are correct, buy there is a check to ensure there is room to insert the data before it is inserted, if you look carefully :)
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#18 Damnape  Icon User is offline

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Posted 06 October 2008 - 03:51 PM

nice job man :^: ...and can you provide another tutorial about mp3 steganography?
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#19 William_Wilson  Icon User is offline

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Posted 06 October 2008 - 04:54 PM

audio steganography certainly has been a popular topic lately. I don't know that it would constitute another tutorial on it's own, but if I get some time I will see what I can do. The code itself wasn't much work write, it's making it a worthwhile tutorial that will take the real work :P
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#20 mtz1406  Icon User is offline

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Posted 11 January 2009 - 02:15 AM

thank you very mich wiliam

yor toturial is clear and very helpful
but I have some question about the code:
1) you seed this can work with (jpg & png ) but when i read the code i did not found any thing like (if png do that else if jpg do that) ,why ?

2) I know that " images may represent each pixel as 32bits and other may be 16 bits and so on , is this code work for the all? if yes how? if no how can i know this image is 32 bits or 16 bits or some thing else and change the LSB for each color (RGB).

3) I know the simple idea of the steganography in images. if I will try to implement the simple idea (change the LSB)
. I will convert the image as array of pixels values then i will deal with there(i dont know how get the pixels value.but this just idea) . but you deal with images as bytes !! are there bytes represent only pixels?what about the bytes represent the image properties like (high, width , and RGB or ARGB) ?"can you explain me"


4) this code hide a text msg. what if i want to hide any binary file?
I will do this:
open the file as binary.then take each bits and wrilte on the LSBs image.after i store the file name and the bits length and the file format.
is ths true or i miss something.

I hope that I explaine my question in clear.and i hope you can help me
thank you very much
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#21 mykkanai  Icon User is offline

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Posted 19 January 2009 - 09:53 PM

your program need a main method..where is the main method of your program regarding to the controller..
i also try to set the controller as main method but it doesn't work.
thanks in advance..
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#22 zueStone  Icon User is offline

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Posted 09 March 2009 - 10:14 PM

View PostWilliam_Wilson, on 12 May, 2007 - 01:24 PM, said:

No problem, i've always enjoyed all forms of encryption and cryptography, but i don't always have time to pursue it. I will admit the idea of modifying the least significant bit is not really my idea, it has been used in many programs over the years, and it is the most logical choice if you understand the importance of each bit.


*I also wanted to take the opportunity to properly describe how the GUI works, as it is simple and not explained anywhere, lol.
Menu Options:

Encode: type or paste the text to encode into the textarea, and press "Encode Now!", this will prompt you with a jfilechooser, which is to pick your image to encode, then you are prompted for an output file name (this does not include the extension, as it will always be .png). If the image is encoded correctly, the end result image will be saved, and then displayed in the decode view.

Decode: will prompt to choose an image, .jpg are available, but it will not work, so select a .png. Once open, select "Decode Now!" and if the image has a hidden message it will be displayed in the textarea of encode view.


I have also been adding some encryption abilities to the text, before it is encoded, both encryptions thus far are bit shifting operations. If there is a demand for it, i can post .jar files of any newer versions i create.
\
it's the technique for encoded image file same with encoded a JAR file.
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#23 mykkanai  Icon User is offline

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Posted 15 March 2009 - 08:41 PM

what if i wanted to encrypt some document files like .doc,.ppt,.xls file type it is possible to encrypt it into image file?and how did i know if this text files are compatible from the chosen image?
hope you can help me regarding with my problem..
thank you...
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#24 anumano  Icon User is offline

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Posted 24 May 2009 - 06:23 PM

how to run this stegano graphy program for me error is coming did i need any separate interface for this.pls reply me
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#25 ma03  Icon User is offline

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Posted 15 July 2009 - 06:34 AM

Thanks alot!
This has really been helping me so far!
Any chance of uploading the updated classes?

ma03
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#26 Antono  Icon User is offline

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Posted 02 August 2009 - 03:38 AM

Why
  if(addition.length + offset > image.length)
and not
 if(addition.length * 8 + offset > image.length)
? You must hide addition.length*8 bits, not only addition.length. Thanks for the answer.
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#27 salentinux  Icon User is offline

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Posted 25 August 2009 - 12:17 AM

Png image with transparent background encodes in a black color background image. How we could modify the code so image bg remains transparent?
tnks

Png image with transparent background encodes in a black color background image. How we could modify the code so image bg remains transparent?
tnks
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#28 kheysha_07  Icon User is offline

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Posted 22 September 2009 - 11:35 PM

hello..

im just a beginner on using netbeans ide.. and im making a project
on image steganography..
how can i get the image using fileBrowser and copy the path of the image on a textfield?

thank you for the response.. :)
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#29 Bverly  Icon User is offline

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Posted 31 October 2009 - 01:21 AM

Awesome tutorial :D.
i have tested this program , it works perfectly however i find that the text affect the image, i can see the difference between 2 image.
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#30 sugeshnambiar  Icon User is offline

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Posted 21 January 2010 - 12:22 PM

hi, nice job william... but can u tell me how u over cumin the disadvantage of jpeg compression.
can u explain me the latest triple-A algorithm for the image steganography.
sugeshnambiar@gmail.com

This post has been edited by sugeshnambiar: 21 January 2010 - 12:24 PM

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