The carrier file can consist of an image, video, sound file or anything else, the file can be viewed as normal even after data has been hidden in them, after hiding data inside a file you will be offered a location to save it, you should get rid of the original file, an easy way to detect hidden data inside photos is by comparing the original file with the one holding a concealed a message, by destroying the original file you make it very hard to detect that something is hidden unless your opponent is specifically looking for steganography messages and has access to steganalysis tools.
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OurSecret is a free steganography tool that can hide text or files inside other any other file, for the receiver to be able to read the message he will have to be using the same software, you can password protect your data to thwart accidental discovery. Unlike encryption, where it is evident that you are trying to hide something from others, steganography allows you to hide secret messages inside a photo (audio, video, etc), post that photo to Flickr, Imgsrc or any other online photoalbum and nobody looking at your activities will notice that you are sending secret data, the receiver will also be safe by visiting a harmless website instead of being seen downloading encrypted messages.
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