Steganography involves concealing information in a way that it's hard for someone to know that it's there. It hides this information in common formats and data files, including documents and images. While steganography is commonly associated with hackers, it is also used to copyright or watermark documents. Linux is a free operating system. If you are using this operating system, then you must use steganography tools compatible with it.
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Steghide is a free program that allows you to hide bits of data in other data files, including image and audio files. It is compatible with JPEG, WAV and BMP file formats, as well as the AU file format, a Sun Microsystems audio format. The Steghide tool allows you to encrypt and compress embedded data. This tool is released under the GNU General Public License, which means that you can change and share this program without paying a licensing fee. You must have these libraries installed on your computer to use this tool: libjpeg, libmhash, libmcrypt and zlib. This tool is compatible with Linux and Windows, and you can download it from the author's website.
If you have a text file that you don't want used without your permission, then you can add a hidden watermark to the file using Snowdrop. Snowdrop is a Linux command line tool, which means that it runs from the Linux command prompt. This tool hides the watermark in four independent logical channels. It helps you trace who used your data without your permission, and it can help you prove that you are the source of the material. Snowdrop also watermarks C sources, including licensed software programs, limited distribution programs and open source code. You can download this program for free either from the Linux App Finder site or the author's website.
You can use Outguess to hide data in any type of data source. It is also a command line tool and supports both JPEG and Portable Any Map (PNM) files. Outguess tracks frequency count statistics, which means that even statistical frequency count tests will not detect the hidden data. A frequency count tests calculates the frequency of ciphertext letters and is used for frequency analysis. The tool figures out how much data it can hide while still keeping the frequency count statistics. This tool is released under the Berkeley Software Distribution (BSD) software license, which means that it is free to use for both commercial and personal use. Download it from the author's website.
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