“Multimedia Steganography with Cipher Text and Compression ppt.

“Multimedia Steganography
with Cipher Text and
Compression “
Synopsis
on

Department
Of
INFORMATION TECHNOLOGY
SUBMITTED BY:
NAME OF STUDENTS
ROLL NO.

INTRODUCTION
Steganography 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 steganous
meaning "covered or protected“ . Generally, messages will appear to be something
else: images, articles, shopping lists, or some other cover text and classically, the
hidden message may be in invisible ink between the visible lines of a private letter.
The advantage of steganography, over cryptography alone, is that
messages do not attract attention to themselves. Plainly visible encrypted
messages no matter how unbreakable will arouse suspicion, and may in
themselves be incriminating in countries where encryption is illegal. Therefore,
whereas cryptography protects the contents of a message, steganography can be
said to protect both messages and communicating parties.
Steganography includes the concealment of information within computer files. In
digital steganography, electronic communications may include steganographic
coding inside of a transport layer, such as a document file, image file, program or
protocol.

Operations of Steganography through a Data flow diagram:

TYPES OF STEGANOGRAPHY
 TEXT STEGANOGRAPHY:
Steganography can be applied to different types of media including
text, audio, image and video etc. However, text steganography is considered
to be the most difficult kind of steganography due to lack of redundancy in
text as compared to image or audio but still has smaller memory occupation
and simpler communication. The method that could be used for text
steganography is data compression.
Data compression encodes information in one representation into
another representation. The new representation of data is smaller in size.
One of the possible schemes to achieve data compression is Huffman
coding. Huffman coding assigns smaller length code words to more
frequently occurring source symbols and longer length code words to less
frequently occurring source symbols.

 AUDIO STEGANOGRAPHY:
In a computer-based audio steganography system, secret messages are
embedded in digital sound. The secret message is embedded by slightly altering
the binary sequence of a sound file. Existing audio steganography software can
embed messages in WAV, AU, and even MP3 sound files.
Embedding secret messages in digital sound is usually a more difficult
process than embedding messages in other media, such as digital images. In
order to conceal secret messages successfully, a variety of methods for
embedding information in digital audio have been introduced.
 VIDEO STEGANOGRAPHY:
It is a technique to hide any kind of files in any extension into a carrying
Video file. This project is the application developed to embed any kind of
data(File) in another file, which is called carrier file. The carrier file must be a
video file. It is concerned with embedding information in an innocuous cover
media in a secure and robust manner. This system makes the Files more secure
by using the concepts Steganography and Cryptography.

 IMAGE STEGANOGRAPHY:
The original image’s integrity is maintained and the decompressed
image output is bit-by-bit identical to the original image input. The most popular
image formats that use lossless compression is GIF (Graphical Interchange
Format) and 8-bit BMP (a Microsoft Windows bitmap file).
Compression plays a very important role in choosing which
steganographic algorithm to use. Lossless compression, on the other hand,
never removes any information from the original image, but instead represents
data in mathematical formulas. Lossy compression techniques result in smaller
image file sizes, but it increases the possibility that the embedded message may
be partly lost due to the fact that excess image data will be removed. Lossless
compression though, keeps the original digital image intact without the chance
of lost, although is does not compress the image to such a small file size.

ADVANTAGES AND DISADVANTAGES:
Steganography is beneficial for securely storing sensitive data, such as hiding
system passwords or keys within other files. However, it can also pose serious
problems because it's difficult to detect. Network surveillance and monitoring
systems will not flag messages or files that contain steganographic data.
Therefore, if someone attempted to steal confidential data, they could conceal it
within another file and send it in an innocent looking email.
DETECTING STEGANOGRAPHY MISUSE:
There are two methods for detecting steganographically-encoded data:
visual steganalysis and statistical steganalysis. The visual method compares a
copy of the source file with the suspect file by running a hash against the source
file and checking that it matches the hash on the suspect copy. Statistical
steganalysis compares theoretically expected frequency distributions of message
content with the frequency distribution of the suspected file. Because the cover
text has to be modified to store the hidden data, there are usually detectable signs
within the cover text's normal characteristics that can be used to reveal the hidden
message. For example, when running a histogram on an image, there should be
random spikes, but if the histogram is flat or has one large spike, it's likely the
image contains hidden information.

CONCLUSION :
Steganography has its place in security. It is not intended to replace
cryptography but supplement it. Hiding a message with steganography methods
reduces the chance of a message being detected. However, if that message is
also encrypted, if discovered, it must also be cracked (yet another layer of
protection).
There are an infinite number of steganography applications. This paper explores
a tiny fraction of the art of steganography. It goes well beyond simply embedding
text in an image. Steganography does not only pertain to digital images but also
to other media (files such as voice, other text and binaries; other media such as
communication channels, the list can go on and on).
Thus, we have designed a software which has a really has a very good
application in real world. It will be notable feature as this system is very easy and
customizable makes it useful to wide variety of the users for Security purposes.

“Multimedia Steganography with Cipher Text and Compression ppt.

More Related Content

What's hot (20)

Viewers also liked (20)

Similar to “Multimedia Steganography with Cipher Text and Compression ppt. (20)

Recently uploaded (20)

“Multimedia Steganography with Cipher Text and Compression ppt.