Steganography Essay

2305 words - 9 pages

Computing Theory Assignment 3 Research Paper PAGE 2
SteganographySteganography ResearchAuthor:Hubert (0807R68878)Raymond Jonathan (0807R67731)Course: Computer ScienceSubject: Computing TheoryLecturer: Ms. Rohini BalapumiWhy Steganography:The authors find the art of Steganography is interesting and even might be very dangerous if used by secret organizations to pass their message online. The authors hope by doing the research of Steganography, more people will aware of the existence of steganography.IntroductionSteganography is the art and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message, a form of security through obscurity. The word steganography is of Greek origin and means "concealed writing" from the Greek words steganos meaning "covered or protected", and graphein meaning "to write". The key concept behind steganography is that the message to be transmitted is not detectable to the casual eye. In fact, people who are not intended to be the recipients of the message should not even suspect that a hidden message exists.History of SteganographyThe first recorded uses of steganography can be traced back to 440 BC when Herodotus mentions two examples of steganography in The Histories of Herodotus . Demaratus sent a warning about a forthcoming attack to Greece by writing it directly on the wooden backing of a wax tablet before applying its beeswax surface. Wax tablets were in common use back then as reusable writing surfaces, sometimes used for shorthand.Another ancient example is that of Histiaeus, who shaved the head of his most trusted slave and tattooed a message on it. After his hair had grown the message was hidden. The purpose was to instigate a revolt against the Persians.The first recorded use of the term Steganography was in 1499 by Johannes Trithemius in his Steganographia , a treatise on cryptography and steganography disguised as a book on magic. Generally, messages will appear to be something else: images, articles, shopping lists, or some other covertext and, classically, the hidden message may be in invisible ink between the visible lines of a private letter.Overview and Steganography FunctionSteganography and Cryptography DifferencesThe difference between steganograpy and cryptography is that in cryptography, one can tell that a message has been encrypted, but he cannot decode the message without knowing the proper algorithm/key. In steganography, the message itself may not be difficult to decode, but most people would not detect the presence of the message. When combined, steganography and cryptography can provide two levels of security. Computer programs exists which encrypt a message using cryptography, and hide the encryption within an image using steganography.Advantages/Disadvantages of SteganographyThe advantage of steganography, over cryptography alone, is that messages do not attract attention to themselves. Plainly visible...

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