The word “Steganography” originated in Greece and literally means “covered
writing”. Digital steganography can be used in graphics files, HTML, sound
files, video, and text files. However, digital image steganography refers to
hiding secret data within a photo, often referred to as stego-images. There are
two methods to doing it: adding bits to the image, or replacing bits in the
image. Adding bits is easy, but it increases the size of the original file,
which could give away that there is data hidden. However, some bits are not
important to the overall file and can be replaced with new bits that include
the secret messages. This is a better approach because it does not have an
effect on the file size and it doesn’t alter the original file.
How
does one hide data in an image? There are several tools that will hide files
inside files. One is called Invisible Secrets 4.1, which can embed any kind of
information within JPEG, PNG, HTML, WAVE or BMP files. After selecting a file
to store the secret information in, you choose which files to store inside the
carrier. You can even include fake files to stir up more confusion and make it
more difficult to find the encrypted information. Once your image is complete,
you won’t even be able to tell the difference between the new and original one.
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