How to Hide Files in Photos With Linux
The "cat" command in Linux combines two files into one, leaving the contents of both original files intact. Use this command to hide any file on your computer inside an image; the resulting file appears to be an image, and opens in an image-viewing program when double-clicked. Only you will know that you can also treat the image as an archive and extract the original hidden file. In this way, you can hide a file containing passwords or other sensitive information without arousing the suspicions of someone who might attempt to spy on you.
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Instructions
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Create a ZIP archive from the file that you want to hide. In the Ubuntu 11.04 Linux distribution, right-click the file and select "Compress" on the context menu. Click the drop-down menu in the upper right corner of the window and select "ZIP." Click the "Create" button to create the archive.
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Place the ZIP archive and the JPG file that you want to hide it in on the desktop.
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Open a terminal window. In Ubuntu, click the "Application" menu at the top of the screen, then click "Accessories" and "Terminal."
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Type "cd Desktop" and press "Enter."
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Type "dir" and press "Enter." You should see the names of the ZIP archive and JPG image.
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Type "cat image.jpg hidden.zip > newimage.jpg" and press "Enter." Substitute "image.jpg" and "hidden.zip" with the names of the JPG image file and ZIP archive. The file name after the ">" symbol is the name of the resulting file; select any name you like. The terminal window drops to the next line without displaying a confirmation. Close the window.
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Double-click the new file to open it in a JPG image viewer, or open it with a ZIP file extraction utility to extract and view your hidden file.
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