04-07-2014, 01:52 PM
MANOHAR PHALKE POLYTECHNIC MUMBAI SION, MUMBAI-22
MANOHAR PHALKE POLYTECHNIC.docx (Size: 46.47 KB / Downloads: 10)
ABSTRACT
The growth of high speed computer networks and that of the Internet, in particular, has increased the ease of Information Communication. Ironically, the cause for the development is also of the apprehension- use of digital formatted data. In comparison with Analog media, Digital media offers several distinct advantages such as high quality, easy editing, high fidelity copying, compression etc. But this type advancement in the field of data communication in other sense has hiked the fear of getting the data snooped at the time of sending it from the sender to the receiver. So, Information Security is becoming an inseparable part of Data Communication. In order to address this Information Security, Steganography plays an important role. Steganography is the art and science of writing hidden messages in such a way that no one apart from the sender and intended recipient even realizes there is a hidden message. This paper is a tutorial review of the steganography techniques appeared in the literature
INTRODUCTION
The desire to send a message as safely and as securely as possible has been the point of discussion since time immemorial. Information is the wealth of any organization. This makes security-issues top priority to an organization dealing with confidential data.Whatever is the method we choose for the security purpose, the burning concern is the degree of security. Steganography is the art of covered or hidden writing [1]. The purpose of steganography is covert communication to hide a message from a third party. Steganography is often confused with cryptology because the two are similar in the way that they both
are used to protect important information [34]. The difference between the two is that Steganography involves hiding information so it appears that no
information is hidden at all. If a person or persons views the object that the information is hidden inside of he or she will have no idea that there is any hidden
information, therefore the person will not attempt to decrypt the information. Steganography in the modern day sense of the word usually refers to information
or a file that has been concealed inside a digital Picture, Video or Audio file
DISCUSSION
Steganography is used to have a level of privacy while doing data communication with others. We have already discussed several methods related with
that. But only the concealment of data may not give the best result always. So, some extra level of security along with the privacy has to be incorporated. Steganography, especially combined with cryptography, is a powerful tool which enables people to communicate without possible eavesdroppers even knowing there is a form of communication in the first place. The methods used in the science of steganography have advanced a lot over the past centuries, especially with the rise of the computer era. Although the techniques are still not used very often, the possibilities are endless. Again the concept of Dual Steganography i.e., first application of steganography in between the embedding object and the cover object and then again apply the same method with the help of other object, can be developed to obtain a new definition of security. Concept of object self encryption technique before the application of teganography to hide that inside a cover can also be developed to achieve a level of security
CONCLUSION
Many different techniques exist and continue to be developed, while the ways of detecting hidden messages also advance quickly. Since detection can
never give a guarantee of finding all hidden information, it can be used together with methods of defeating steganography, to minimize the chances of
hidden communication taking place. Even then, perfect steganography, where the secret key will merely point out parts of a cover source which form
the message, will pass undetected, because the cover source contains no information about the secret message at all. In the near future, the most important use of steganographic techniques will probably be lying in the field of digital watermarking. Content providers are eager to protect their copyrighted works against illegal distribution and digital watermarks provide a way of tracking the owners of these materials. Although it will not prevent the distribution itself, it will enable the content provider to start legal actions against the violators of the copyrights, as they can now be tracked down. Steganography might also become limited under laws, since governments already claimed that criminals use these techniques to communicate. More restrictions on the use of privacy-protecting technologies are not very unlikely, especially in this period of time with great anxiety of terrorist and other attacks