Steganography

MESSAGE CONCEALMENTUSING

STEGANOGRAPHY

Guided By:- Presented By:

• Steganography is the art of hiding the fact that communication is taking place, by hiding information in other information.

• . Many different carrier file formats can be used, but digital images are the most popular because of their frequency on the Internet.

• There exists a large variety of steganographic techniques some are more complex than others and all of them have respective strong and weak points .

• In this report I have studied a different types of algorithms available for image steganography and a comparison of them is prepared.

• I have proposed one LSB based technique as future work

• Steganography is the art and science of writing hidden messages .

• The word "Steganography" is of Greek origin and means "covered, or hidden writing". Its ancient origins can be traced back to 440 BC.

• This is in contrast to cryptography, where the existence of the message itself is not disguised, but the content is obscured.

Cryptography is secret writing

In cryptography the message will be encrypted and cannot be decoded without

knowing the proper key.

Steganography is the act of adding a hidden message to an image or other media file. It is similar to encrypting a document, but instead of running it through a cypher, the document is broken up and stored in unused, or unnoticable, bits within the overall image.

Watermarking attempts to hide a message as it is to tag a document for later identification. Watermarking is used to protect the copyright of the original owner

Text Steganography

Line-shift encoding Word-shift encoding Feature specific encoding:

Image Steganography

Image DomainTransform Domain

Audio Steganography

DCTLSB

WaveletsWavelets are mathematical functions that cut

up data into different frequency components, and then study each component with a resolution matched to its scale. They have advantages over traditional Fourier methods in analyzing physical situations where the signal contains discontinuities and sharp spikes.

Advantages of waveletDecomposes the signal

High level and Low level

System architecture

Stego-K ey k

UntrustedChannel

M essage m

StegoObjects

StegoObjects

CoverObjectc

M essage m

StegoObjects

ALGORITHM

HARDWARE REQURIMENT

P4 SYSTEM

SOFTWARE REQUIREMENT

MATLAB

1. efficient data hiding

No change in size of audio

Future Work1. Using wavelet approach to hide info inside

video

2. Combining DCT and DWT

3. Adding audio inside audio

[1] T Morkel, JHP Eloff and MS Olivier, "An Overview of Image Steganography," in Proceedings of the

Fifth Annual Information Security South Africa Conference (ISSA2005), Sandton, South Africa, June/July 2005.

[2] M.Kharrazi,H.T.Sencar and N.Menon ,”image steganography concepts and practice”,WSPC lecture

notes 2004.[3] Jamil, T., “Steganography: The art of hiding

information is plain sight”, IEEE Potentials, 18:01, 1999

[4] Wang, H & Wang, S, “Cyber warfare: Steganography vs. Steganalysis”, Communications of the ACM, 47:10, October 2004.

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