TAILIEUCHUNG - Steganography

Now that we have taken a detailed look at cryptography, lets take a look at another related area, which is steganography or data hiding. Steganography (“stego”) is related to cryptography (“crypto”) because with both fields you do not want someone to be able to read your message, but stego does it with a slightly different approach. | Steganography Security Essentials The SANS Institute Encryption and Exploits - SANS 2001 1 Now that we have taken a detailed look at cryptography lets take a look at another related area which is steganography or data hiding. Steganography stego is related to cryptography crypto because with both fields you do not want someone to be able to read your message but stego does it with a slightly different approach. With crypto the message is garbled in such a way that someone cannot read the message but they can tell that the message is encrypted. In certain environments this could raise the suspicion to an unacceptable level. With stego the real message is hidden in an overt message so someone can not even tell that you are sending a secret message. As you will see in practice the two are often used together. Stego is a new area and hopefully you will find it exciting. We will also show you several of the tools that exist for hiding information and give you links where you can download the tools and try them out for yourself. 4 - 1 Steganography Stego Steganography abbreviated as stego not to be confused with stenography. Involves concealing the fact that you are sending sensitive information Data hiding Relatively new field Can hide in a variety of formats - Images Bmp Gif Jpg - Word Documents - Text Documents - Machine Generated Images fractals Steganography - SANS 2001 2 Steganography is a fairly new but very interesting field. It involves hiding data within another image so that the meaning of the message and the fact that a message is being sent is concealed. There are methods where data can be embedded in a wide range of file types using a variety of methods. 4 -2 Crypto vs. Stego Cryptography Crypto provides confidentiality but not secrecy. It is fairly easy to detect that someone is sending an encrypted message it is just very hard for someone to read it. With stego you do not even know someone is sending a message you are hiding the true intent. Steganography

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