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  • How to Hide Secret Data Inside an Image or Audio File in SecondsSteganography is useful in runescape gold situations where sending encrypted messages might raise suspicion, such as in countries where free speech is suppressed. It's also frequently used as a digital watermark to find when images or audio files are stolen. And on a less practical note it's just cool.

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    Steganography is the art of hiding information in plain sight, and in this tutorial, I'll show you how to use Steghide a very simple command line tool to do just that. In addition, I'll go over a bit of conceptual background to help you understand what's going on behind the scenes. This is a tool that's simple, configurable, and only takes a few seconds to hide information in many file types.

    What Is Steganography?Unlike encryption, where it's obvious that a message is being hidden, steganography hides data in plain view, inside a file such as a picture. As far as images are concerned, to anyone who isn't aware that it contains hidden data, it looks like just a normal, innocent picture.More Info: A Beginner's Guide to Steganography

    How Is Steganography Implemented?There are several different techniques for concealing data inside of normal files. One of the most widely used and perhaps simplest to understand is the least significant bit technique, known commonly as LSB.This technique changes the last few bits in a byte to encode a message, which is especially useful in something like an image,

    where the red, green, and blue values of each pixel are represented by eight bits (one byte) ranging from 0 to 255 in decimal or 00000000 to 11111111 in binary.Changing the last two bits in a completely red pixel from 11111111 to 11111101 only changes the red value from 255 to 253, which to the naked eye creates a nearly imperceptible change in color but still allows us to encode data inside of the picture.

    $ steghide extract sf stegoFile xf outputFileOnce you run this command, you'll be prompted to enter the same password you created above in order to create the extracted file. It's that simple!I extracted the stego data from the image to a file and displayed its contents in the terminal.Hiding Data in Images Is Just Too EasyThe advantage of steganography is that you can hide data in plain sight, but you can really blow it if you don't follow some common sense rules. First, the small differences steganography introduces are hard to detect unless you have the original.Using an image you found off the internet without modifying it significantly makes it easy to detect that an image has hidden information. To check this, try a reverse Google Image search to make sure the original isn't floating around somewhere.

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