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Thread: HELP: Hiding files(any type such .doc,.txt etc) inside an Image file(preferbly jpg) aka Steganography

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    Default HELP: Hiding files(any type such .doc,.txt etc) inside an Image file(preferbly jpg) aka Steganography

    I am trying to make a GUI Java Program, where a file will be hidden inside an image file.
    So I have a rough idea which is as follows:
    Encryption
    1. Read an image file and a file(say file-2)
    2. Modify the code of image file, we modify the LSB(Least Significant Bit)
    3. The LSB's are replace with the code of the file-2
    4. A new image file is created.


    I want to first get the Encryption part clear.
    So guys help me...


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    Default Re: HELP: Hiding files(any type such .doc,.txt etc) inside an Image file(preferbly jpg) aka Steganography

    Can you explain what type of encryption you are doing to the input file before its bits are inserted into the image?

    What kind of image file are you thinking of using? Does it preserve all the bits for the pixels of the image over reads and writes? For example, I think a jpeg image's pixels can be changed every time the image is written.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: HELP: Hiding files(any type such .doc,.txt etc) inside an Image file(preferbly jpg) aka Steganography

    Can you explain what type of encryption you are doing to the input file before its bits are inserted into the image?
    Sorry my mistake! I shouldn't have written 'encryption', instead I should have written Hiding.
    No encryption, just writing the bits of file-2 to image file using LSB so that there is negligible difference from the original (image file).

    What kind of image file are you thinking of using? Does it preserve all the bits for the pixels of the image over reads and writes? For example, I think a jpeg image's pixels can be changed every time the image is written.
    For convenient I am thinking of jpeg, and I want to alter the bits for the pixels using LSB for negligible difference.
    Also I am also wondering what size of file-2 can a 1920x1200 px jpeg accommodate?

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    Default Re: HELP: Hiding files(any type such .doc,.txt etc) inside an Image file(preferbly jpg) aka Steganography

    To make sure the writing of a jpeg image doesn't change any of its contents, write a test program that reads and saves in memory the pixels from an image and then writes it and reads it back and compares the saved pixels with those read in to see if there were any changes made.

    what size of file-2 can a 1920x1200 px jpeg accommodate
    If one bit/pixel then divide the number of pixels by the number of bits / byte
    If you don't understand my answer, don't ignore it, ask a question.

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