Cryptography attempts to conceal messages by various translation methods that create new, unrecognizable messages. Even though this new, encoded message may be unintelligible to an observer it still remains in plain view. By contrast, the main purpose of steganography or "stego" as it is often called is to hide even the occurrence of messages. While the underlying concepts of steganography have been around for thousands of years, it wasn't until the mid 90s that the concepts evolved into software capable of being run on standard PCs. Trying to keep up with developments in steganography is steganalysis, the science of discovering hidden messages. Today, messages can be hidden in a variety of audio and video files using increasingly sophisticated tools that incorporate both steganography and cryptography. The aptly named "OutGuess", a modern stego tool available from the Internet already makes the claim to be able to defeat steganalytical tools that use statistical analysis.
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