| 1.0 IntroductionSteganography is one of
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| | should not rely on the on its method of
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| the oldest arts that people have always
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| | operation being unknown to the enemy, but
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| wanted to have since they started
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| | rather on the choice of a secret key.1.1
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| communicating with each other, but sadly
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| | BackgroundIn recent years there has been
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| the least researched. Most people study
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| | an exciting convergence of information
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| steganography either as academic
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| | protection technologies and the main
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| discipline or out of curiosity and I
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| | emphasis is information hiding as oppose
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| belong to the latter camp. Although
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| | to encryption. The two big policy issues
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| steganography is used in military and
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| | of copyright protection and state
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| commercial circuits the level of
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| | surveillance motivated this development.
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| application and understanding is very
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| | The more information that is placed on
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| low.The term steganography as well
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| | the Internet or public media, the more
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| cryptography was derived from the Greek
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| | the owner of the information need to
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| language. The prefix crypto comes from
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| | protect themselves from theft and abuse.
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| the Greek word kryptos, which means
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| | The entertainment industry is
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| hidden or secret. The suffix graphy was
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| | particularly very nervous due to the ease
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| derived from graphia, which means
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| | at which exact copies of digital music
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| writing. Cryptography is essentially the
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| | and video can be made. The way forward is
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| art of secret writing and the goal is to
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| | to embrace advance technology to protect
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| maintain the secrecy of the message even
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| | investment rather than oppose it. Part of
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| if it is visible. Steganography is also a
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| | the solution may be a change in the sale
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| form of writing (concealed writing). The
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| | process of music and video; one mechanism
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| Greek word steganos means unseen or
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| | is copyright marking (hiding notices and
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| hidden. Steganography is a form of hidden
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| | serial numbers in a way that would be
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| communication, it should not be seen as a
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| | difficult for pirates to remove). Systems
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| replacement for cryptography but rather
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| | and techniques that can uncover hidden
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| as a complement to it. Steganography,
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| | information will be useful in computer
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| although closely related to cryptography,
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| | forensics and digital traffic analysis.
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| is different. The goal of cryptography is
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| | Understanding the limitations of current
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| to conceal the content of a message,
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| | techniques can help develop more robust
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| while the goal of steganography is to
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| | techniques. The principal focus is hiding
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| conceal the existence of a message.
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| | information or at least stopping other
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| However, these two techniques can be
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| | people from hiding information.2.0
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| combined effectively by first encrypting
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| | SteganographySteganographic techniques
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| the secret message before embedding in a
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| | have been used since World War I and
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| cover data. Concealing the transmission
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| | World War II, Chemicals were developed
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| of encrypted messages enhances their
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| | and used as secret inks that become
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| overall security since outsiders are
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| | visible when brought in contact with
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| unaware of the communication.Encrypted
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| | other chemicals. A brief history of
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| data can attract the attention of hackers
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| | steganography would give us a valuable
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| and investigators through its mere
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| | background.2.1 HistoryGreek historian
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| existence, however if concealed, no
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| | Herodotus recorded the earliest records
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| attempt would be made to break the code
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| | of steganography. When Histiaeus had to
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| or to obtain the secret key.
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| | send a secret message to his son-in-law,
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| Steganographic methods primarily use
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| | he shaved the head of a slave and
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| image or audio files to hide encrypted
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| | tattooed a message, he waited till the
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| data, such techniques conceal information
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| | hair had grown before dispatching him in
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| in the least significant bits of the
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| | order to avoid detection. Another Greek
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| carrier medium, which serves as a hiding
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| | history was when Demeratus scraped the
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| place. It is important that the carrier
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| | wax off tablets and wrote messages on the
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| medium does not lose its appearance after
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| | underlying wood he then covered the wood
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| the embedding process.Another technique
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| | with wax again to conceal the message.
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| similar to steganography is watermarking,
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| | The tablets appear to be blank and unused
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| the goal of watermarking is to mark an
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| | when inspected.Invisible ink has always
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| image or sound file to the owner by
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| | been a popular method of steganography.
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| making elusive modifications to the file.
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| | Ancient Romans wrote between lines using
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| These modifications should not be
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| | invisible inks made from substances like
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| noticeable but rather, very robust;
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| | milk, urine and fruit juices. When it is
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| nobody should be able to remove an
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| | heated, the invisible ink would darken
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| existing mark or mark an already marked
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| | and become legible.Gaspari Schotti wrote
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| file as belonging to him. This technique
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| | the earliest book on steganography in
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| is of great interest to the entertainment
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| | 1665 called Steganographica. A major
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| industry because it gives an efficient
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| | development in the field occurred in 1883
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| way to determine if a file was illegally
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| | with the publication of Auguste
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| downloaded from the web or rightfully
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| | Kerckhoffs cryptographie militaire.
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| purchased.A good steganography system
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| | Although the work was mostly on
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| should fulfil the same requirements posed
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| | cryptography, it provides valuable
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| by the Kerckhoff principle in
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| | principle in the design of new
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| cryptography that security of a system
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| | steganographic systems [SEL03].2.
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