Steganography In Images (Download Seminar Report)
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In this paper, we aim to present a general introduction to steganography or data-hiding as it is sometimes just known. We then turn to data-hiding in images. When examining these data-hiding techniques, we bear in mind Benderâ„¢s specifications, such as degradation of the cover data must be kept to a minimum, and the hidden data must be made as immune as possible to possible attack from manipulation of the cover data.

Steganography in images has truly come of age with the invention of fast, powerful computers. Software is readily available off the Internet for any user to hide data inside images. These softwares are designed to fight illegal distribution of image documents by stamping some recognisable feature into the image.The most popular technique is Least Significant Bit insertion, which we will look at. Also, we look at more complex methods such as masking and filtering, and algorithms and transformations, which offer the most robustness to attack, such as the Patchwork method which exploits the human eyeâ„¢s weakness to luminance variation.

we will take a brief look at steganalysis, the science of detecting hidden messages and destroying them. We conclude by finding that steganography offers great potential for securing of data copyright, and detection of infringers. Soon, through steganography,personal messages,files, all artistic creations, pictures, and songs can be protected from piracy.
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[attachment=3860]


Steganography In Images





ABSTRACT:

In this paper, we aim to present a general introduction to steganography or data-hiding as it is sometimes just known. We then turn to data-hiding in images. When examining these data-hiding techniques, we bear in mind Bender's specifications, such as degradation of the cover data must be kept to a minimum, and the hidden data must be made as immune as possible to possible attack from manipulation of the cover data.
Steganography in images has truly come of age with the invention of fast, powerful computers. Software is readily available off the Internet for any user to hide data inside images. These softwares are designed to fight illegal distribution of image documents by stamping some recognisable feature into the image.The most popular technique is Least Significant Bit insertion, which we will look at. Also, we look at more complex methods such as masking and filtering, and algorithms and transformations, which offer the most robustness to attack, such as the Patchwork method which exploits the human eye's weakness to luminance variation.
we will take a brief look at steganalysis, the science of detecting hidden messages and destroying them. We conclude by finding that steganography offers great potential for securing of data copyright, and detection of infringers. Soon, through steganography,personal messages,files, all artistic creations, pictures, and songs can be protected from piracy.

INTRODUCTION:


Steganography, from the Greek, means covered, or secret writing, and is a long-practised form of hiding information. Although related to cryptography, they are not the same. Steganography's intent is to hide the existence of the message, while cryptography scrambles a message so that it cannot be understood.

More precisely,

'the goal of steganography is to hide messages inside other harmless messages in a way that does not allow any enemy to even detect that there is a second secret message present."
Steganography includes a vast array of techniques for hiding messages in a variety of media. Among these methods are invisible inks, microdots, digital signatures, covert channels and spread-spectrum communications. Today, thanks to modern technology, steganography is used on text, images, sound, signals, and more.
In the following sections we will try to show how steganography can and is being used through the media of images.


KERCKOFF PRINCIPLE:

In cryptography. This principle states that "the security of the system has to be based on the assumption that the enemy has full knowledge of the design and implementation details of the steganographic system". The only missing information for the enemy is a

short, easily exchangeable random number sequence, the secret key.

User can get the
hidden information using password







When embedding data, it is important to remember the following restrictions and features:

¢ The cover data should not be significantly degraded by the embedded data, and the embedded data should be as imperceptible as possible. (This does not mean the embedded data needs to be invisible; it is possible for the data to be hidden while it remains in plain sight.)
¢ The embedded data should be directly encoded into the media, rather than into a header or wrapper, to maintain data consistency across formats.
¢ The embedded data should be as immune as possible to modifications from intelligent attacks or anticipated manipulations such as filtering and resampling.
¢ Some distortion or degradation of the embedded data can be expected when the cover data is modified. To minimise this, error correcting codes should be used.
¢ The embedded data should be self-clocking or arbitrarily re-entrant. This ensures that the embedded data can still be extracted when only portions of the cover data is available. For example, if only a part of image is available, the embedded data should still be recoverable.



Steganography in Images:

In this section we deal with data encoding in still digital images. In essence, image steganography is about exploiting the limited powers of the human visual system (HVS). Within reason, any plain text, cipher text, other images, or anything that can be embedded in a bit stream can be hidden in an image. Image steganography has come quite far in recent years with the development of fast, powerful graphical computers, and steganographic software is now readily available over the Internet for everyday users.




IMAGES:

To a computer, an image is an array of numbers that represent light intensities at various points, or pixels. These pixels make up the image's raster data. An image size of 640 by 480 pixels, utilizing 256 colors (8 bits per pixel) is fairly common. Such an image would contain around 300 kilobits of data.


Digital images are typically stored in either 24-bit or 8-bit per pixel files. 24-bit images are sometimes known as true colour images. Obviously, a 24-bit image provides more space for hiding information; however, 24-bit images are generally large and not that common. A 24-bit image 1024 pixels wide by 768 pixels high would have a size in excess of 2 megabytes. As such, large files would attract attention were they to be transmitted across a network or the Internet. Image compression is desirable. However, compression brings with it other problems, that shall be explained shortly.
Alternatively, 8-bit colour images can be used to hide information. In 8-bit colour images, (such as GIF files), each pixel is represented as a single byte. Each pixel merely points to a colour index table, or palette, with 256 possible colours. The pixel's value, then, is between 0 and 255. The image software merely needs to paint the indicated colour on the screen at the selected pixel position.
If using an 8-bit image as the cover-image, many steganography experts recommend using images featuring 256 shades of gray as the palette, for reasons that will become apparent. Grey-scale images are preferred because the shades change very gradually between palette entries. This increases the image's ability to hide information.
When dealing with 8-bit images, the steganographer will need to consider the image as well as the palette. Obviously, an image with large areas of solid color is a poor choice, as variances created by embedded data might be noticeable. Once a suitable cover image has been selected, an image encoding technique needs to be chosen.




Image Compression:

Image compression offers a solution to large image files. Two kinds of image compression are lossless and lossy compression. Both methods save storage space but have differing effects on any uncompressed hidden data in the image.
Lossy compression, as typified by JPEG (Joint Photographic Experts Group) format files, offers high compression, but may not maintain the original image's integrity. This can impact negatively on any hidden data in the image. This is due to the lossy compression algorithm, which may "lose" unnecessary image data, providing a close approximation to high-quality digital images, but not an exact duplicate. Hence, the terrrf'lossy" compression. Lossy compression is frequently used on true-colour images, as it offers high compression rates.
Lossless compression maintains the original image data exactly; hence it is preferred when the original information must remain intact. It is thus more favoured by steganographic techniques. Unfortunately, lossless compression does not offer such high compression rates as lossy compression. Typical examples of lossless compression formats are Compuserve's GIF (Graphics Interchange Format) and Microsoft's BMP (Bitmap) format.

Image Encoding Techniques:

Information can be hidden many different ways in images. Straight message insertion can be done, which will simply encode every bit of information in the image. More complex encoding can be done to embed the message only in "noisy" areas of the image that will attract less attention. The message may also be scattered randomly throughout the cover image.







The most common approaches to information hiding in images are:
¢ Least significant bit (LSB) insertion
¢ Masking and filtering techniques
¢ Algorithms and transformations
Each of these can be applied to various images, with varying degrees of success. Each of them suffers to varying degrees from operations performed on images, such as cropping, or resolution decrementing, or decreases in the colour depth.



LEAST SIGNIFICANT BIT INSERTION:

One of the most common techniques used in steganography today is called least significant bit (LSB) insertion. This method is exactly what it sounds like; the least significant bits of the cover-image are altered so that they form the embedded information. The following example shows how the letter A can be hidden in the first eight bytes of three pixels in a 24-bit image.

Pixels:

(00100111 11101001 11001000) (00100111 11001000 11101001) (11001000 00100111 11101001)


A: 10000001

Result: (00100111 11101000 11001000) (00100110 11001000 11101000)
(11001000 00100111 11101001)

The three underlined bits are the only three bits that were actually altered. LSB insertion requires on average that only half the bits in an image be changed. Since the 8-bit letter A only requires eight bytes to hide it in, the ninth byte of the three pixels can be used to hide the next character of the hidden message.

A slight variation of this technique allows for embedding the message in two or more of the least significant bits per byte. This increases the hidden information capacity of the cover-object, but the cover-object degrades more statistically, and it is more detectable. Other variations on this technique include ensuring that statistical changes in the image do not occur. Some intelligent software also checks for areas that are made up of one solid color. Changes in these pixels are then avoided because slight changes would cause noticeable variations in the area.


Advantages of LSB Insertion:

> Major advantage of the LSB algorithm is it is quick and easy.
> There has also been steganography software developed which work around LSB color alterations via palette manipulation.
> LSB insertion also works well with gray-scale images.
> A slight variation of this technique allows for embedding the message in two or more of the least significant bits per byte. This increases the hidden information capacity.



Masking and filtering :

Masking and filtering techniques hide information by marking an image in a manner similar to paper watermarks. Because watermarking techniques are more integrated into the image, they may be applied without fear of image destruction from lossy compression. By covering, or masking a faint but perceptible signal with another to make the first non-perceptible, we exploit the fact that the human visual system cannot detect slight changes in certain temporal domains of the image.
Technically, watermarking is not a steganographic form. Strictly, steganography conceals data in the image; watermarking extends the image information and becomes an attribute of the cover image, providing license, ownership or copyright details.
Masking techniques are more suitable for use in lossy JPEG images than LSB insertion because of their relative immunity to image operations such as compression and cropping.



Algorithms and transformations:

Because they are high quality colour images with good compression, it is desirable to use JPEG images across networks such as the Internet. Indeed, JPEG images are becoming abundant on the Internet.
JPEG images use the discrete cosine transform (DCT) to achieve compression. DCT is a lossy compression transform, because the cosine values cannot be calculated precisely, and rounding errors may be introduced. Variances between the original data and the recovered data depends on the values and methods used the calculate the DCT.
Images can also be processed using fast Fourier transformation and wavelet transformation. Other properties such as luminance can also be utilised. The HVS has a very low sensitivity to small changes in luminance, being able to discern changes of no less than one part in thirty for random patterns. This figure goes up to one part in 240 for uniform regions of an image.
Modern steganographic systems use spread-spectrum communications to transmit a narrowband signal over a much larger bandwidth so that the spectral density of the signal in the channel looks like noise.
The two different spread-spectrum techniques these tools employ are called direct-sequence and frequency hopping. The former hides information by phase-modulating the data signal (carrier) with a pseudorandom number sequence that both the sender and the receiver know. The latter divides the available bandwidth into multiple channels and hops between these channels (also triggered by a pseudorandom number sequence).
The Patchwork method is based on a pseudorandom, statistical process that takes advantage of the human weaknesses to luminance variation. Using redundant pattern encoding to repeatedly scatter hidden information throughout the cover image, like a patchwork, Patchwork can hide a reasonably small message many times in a image. In the Patchwork method, n pairs of image points (a,b) are randomly chosen. The brightness of a is decreased by one and the brightness of b is increased by one. For a labeled image, the expected value of the sum of the differences of the n pairs of points is then 2n. Bender shows that after JPEG compression, with the quality factor set to 75, the message can still be decoded with an 85
This algorithm is more robust to image processing such as cropping and rotating, but at the cost of message size. Techniques such as Patchwork are ideal for watermarking of images. Even if the image is cropped, there is a good probability that the watermark will still be readable.
Other techniques encrypt and scatter the hidden throughout the image in some pre¬determined manner. It is assumed that even if the message bits are extracted, they will be useless without the algorithm and stego-key to decode them. Although such techniques do help protect against hidden message extraction, they are not immune to destruction of the hidden message through image manipulation.
















SYSTEM DESIGN:


These are the steps followed in image hiding while transmission and de noising after receiving:
1. Get a cover image (publicly accessible material)
2. Take the information to be hidden (message or image)
3. Combine cover image with the information to be hidden(we follow LSB algorithm for this)
4. While transmission it will be corrupted by noise
5. Use any of the filtering methods, ex: wiener filtering for de noising in wavelet domain
6. Here filter is employed in order to remove the noise
7. During extraction a password check is provided
8. If password is matched then extraction of hidden information.

Conclusion:

In this paper, we take an introductory look at steganography. Several methods for hiding data in, images were described, with appropriate introductions to the environments of each medium, as well as the strengths and weaknesses of each method.The key algorithm for designing the steganography system has been dealt. Most data-hiding systems take advantage of human perceptual weaknesses, but have weaknesses of their own. We conclude that for now, it seems that no system of data-hiding is totally immune to attack.
However, steganography has its place in security. Though it cannot replace cryptography totally, it is intended to supplement it. Its application in watermarking and fingerprinting, for use in detection of unauthorised, illegally copied material, is continually being realised and developed.
Also, in places where standard cryptography and encryption is outlawed, steganography can be used for covert data transmission. Steganography can be used along with cryptography to make an highly secure data high way.Formerly just an interest of the military, Steganography is now gaining popularity among the masses. Soon, any computer user will be able to put his own watermark on his artistic creations.

Bibliography:

1.M.Kuhn.
Steganography mailing list.
WWW: http://jjtcSteganography/steglist.htm, 1995. Private Site, Hamburg, Germany



2. N.F. Johnson.
Steganography.
WWW: http://jjtcstegdoc/. George Mason University

3. C. Kurak and J. McHugh.
A cautionary note on image downgrading.
In Proceedings of the 8th Annual Computer Security Applications Conference, pages 153-159, 1992.


4. W. Bender, D. Gruhl, N. Morimoto, and A. Lu.
Techniques for data hiding.
In IBM Systems Journal, Vol. 35, Nos. 3-4, pages 313-336, February 1996.
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[attachment=6300]

teganography In Images

Steganography In Images
ABSTRACT:
In this paper, we aim to present a general introduction to steganography or data-hiding as
it is sometimes just known. We then turn to data-hiding in images. When examining these
data-hiding techniques, we bear in mind Bender's specifications, such as degradation of
the cover data must be kept to a minimum, and the hidden data must be made as immune
as possible to possible attack from manipulation of the cover data.
Steganography in images has truly come of age with the invention of fast, powerful
computers. Software is readily available off the Internet for any user to hide data inside
images. These softwares are designed to fight illegal distribution of image documents by
stamping some recognisable feature into the image.The most popular technique is Least
Significant Bit insertion, which we will look at. Also, we look at more complex methods
such as masking and filtering, and algorithms and transformations, which offer the most
robustness to attack, such as the Patchwork method which exploits the human eye's
weakness to luminance variation.
we will take a brief look at steganalysis, the science of detecting hidden messages and
destroying them. We conclude by finding that steganography offers great potential for
securing of data copyright, and detection of infringers. Soon, through
steganography,personal messages,files, all artistic creations, pictures, and songs can be
protected from piracy.
Reply
#8
[attachment=10487]
Cryptograpy & Steganography vs. Watermarking Comparison
• Cryptography is about protecting the content of messages (their meaning).
• Steganography is about concealing the existence of messages
• Watermarking is about establishing identity of information to prevent unauthorized use
– They are imperceptible
– They are inseparable from the works they are embedded in
– They remain embedded in the work even during transformation
Steganography
Basics

• The word steganography comes from the Greek steganos , meaning covered or secret, and graphy , meaning writing or drawing. Therefore, steganography literally means covered writing.
• Steganography simply takes one piece of information and hides it within another
– Computer files (images, sounds recordings, even disks) contain unused or insignificant areas of data
– Steganography takes advantage of these areas, replacing them with information (encrypted mail, for instance).
– The files can then be exchanged without anyone knowing what really lies inside of them
– An image of the space shuttle landing might contain a private letter to a friend.
– Rumor has it that terrorists used steganography to transmit messages to one another. (http://wirednews/politics/0,1283,41658,00.html)
Steganography
Early Examples

In his history of the Persian Wars, Herodotus tells of a messenger who shaved his head and allowed a secret message to be tattooed on his scalp. He waited until his hair grew back. Then he journeyed to where the recipient awaited him and shaved his head again. The message was revealed. It was history’s first use of steganography.
Steganography
Invisible Ink

Ancient Romans used to write between lines using invisible ink based on various natural substances such as fruit juices, urine, and milk. Their experience was not forgotten: even nowadays children play spies and write secret messages that appear only when heated.
During the World War II the Germans developed the microdot. A secret message was photographically reduced to the size of a period, and affixed as the dot for the letter 'i' or other punctuation on a paper containing a written message. Microdots permitted the transmission of large amounts of printed data, including technical drawings, and the fact of the transmission was effectively hidden.
• Computer Steganography is based on two principles.
– The first one is that the files containing digitized images or sound can be altered to a certain extend without loosing their functionality.
– The other principle deals with the human inability to distinguish minor changes in image color or sound quality, which is especially easy to make use of in objects that contain redundant information, be it 16-bit sound, 8-bit or even better 24-bit image. The value of the least significant bit of the pixel color won’t result in any perceivable change of that color.
• The data to be concealed is compressed and hidden within another file.
• The first step is to find a file which will be used to hide the message (also called a carrier or a container.)
• The next step is to embed the message one wants to hide within the carrier using a steganographic technique.
• Two different techniques commonly used for embedding are:
– Replace the least significant bit of each byte in the [carrier] with a single bit for the hidden message.
– Select certain bytes in which to embed the message using a random number generator; resampling the bytes to pixel mapping to preserve color scheme, in the case of an image...; hiding information in the coefficients of the discrete cosine, fractal or wavelet transform of an image; and applying mimic functions that adapt bit pattern to a given statistical distribution."
• EZStego (Stego Online, Stego Shareware, Romana Machado)
– Java based software program which supports only GIF and PICT formats;
• Gif-It-Up v1.0 (Lee Nelson)
– A stego program for Windows 95 that hides data in GIF files
• Hide and Seek (Colin Maroney)
– can hide any data into GIF images;
• JPEG-JSTEG (Derek Upham)
– can hide data inside a JPEG file
• MP3Stego (Fabien A.P. Petitcolas, Computer Laboratory, University of Cambridge)
– can hide data inside MP3 sound files;
• Steganos (Demcom, Frankfurt, Germany)
– encrypts files and then hides them within BMP, DIB, VOC, WAV, ASCII and HTML files.
Reference:http://antichildpornsteganog.html
• S-Tools is one of the most popular steganography tools.
– This program is Windows 95/98 compatible
– It has the ability to conceal files within BMP, GIF and WAV files.
– Allows you to simply point and click your way to hiding files.
– It also has the ability to hide multiple files in one container.
– It has been updated each year and can be easily downloaded by anyone. (http://members.tripodsteganography/stego/software.html)
– Steganalysis is the art of discovering and rendering useless such covert messages.
• Steganalysis involves analysis of the carrier file
– Simpler steganographic techniques produce some discernible change in the file size, statistics or both.
– These changes can manifest themselves in color variations, loss of resolution and other distortions that are visible to the human eye.
– This form of detection requires that you know what the original carrier image or file should look like.
• Watermarking is the practice of hiding a message about an image, audio clip, or other work of media within the work itself.
– Watermark is hidden from the user in normal use
– Watermark becomes visible as a result of a special viewing process
• Sending a message to a spy by marking certain letters in a newspaper using invisible ink
• Adding sub-perceptible echo at certain places in an audio recording.
• Embedding a picture of President Andrew Jackson into the paper during paper making process.
“In 1981, photographic reprints of confidential British
Cabinet Documents were being printed in newspapers.
Rumor has it that to determine the source of the leak,
Margaret Thatcher arranged to distribute uniquely identifiable
copies of the documents to each of the ministers. Each copy had
a different word spacing that was used to encode the identity of
the recipient.”
- Digital Watermarking, Cox
• A digital watermark is a digital signal or pattern inserted into a digital image.
• In a broadcast monitoring system identifying data is added to the video/audio signal prior to transmission
• Two kinds of monitoring systems exist
– Passive Monitoring:
• Recognize the content being broadcast
• Compares received signals against a database of known content
• Very expensive as large frames need to be compared
• Useful for monitoring of competition
– Active Monitoring:
• Rely on information that is broadcast along with the content
• Relatively easier to implement
• Identification information is easily to interpret
• Requires cooperation of broadcasting mechanism
• Under US law the creator of a story, painting, song, or any other original work holds copyright the instant it is recorded in some physical form
– Up to 1998 a copyright notice was required to be attached to each distributed copy if the owner wanted to protect his/her rights
– Even after the change in 1998 when this is no longer required the awards are reduced significantly if the copyright information is not present with the work
• Textual Copyright notices have several limitations
– They are easy to remove deliberately or inadvertently
– They can be aesthetically ugly if they cover a part of the image
– For music the copyright is only on the media not on the work
• Electronic watermarks are imperceptible and inseparable from the work they are contained and are hence superior
• Textual notices can be erased and replaced by a forger
– Image editors can be used to edit copyright notices
– One solution is to register the image with copyright depository (expensive)
• Watermarking can prove image identity
– Watermarks may also be altered
– It is possible to prove that one image is derived from another indirectly proving the ownership
• Transaction Tracking
• Content Authentication
• Copy Control
• Device Control
• Should be perceptually invisible to prevent obstruction of the original image.
• Statistically invisible so it cannot be detected or erased.
• Simple to extract watermark from image
– Otherwise, the detection process requires too much computation time.
• Detection should be accurate.
– Few false positives & false negatives
• Should be able to produce numerous watermarks.
– Otherwise, only a limited number of images may be marked.
• Should be robust to filtering, additive noise, compression, and other forms of image manipulation.
• Should be able to determine the true owner of the image.
• M-Sequence Generator
– Embedded or added to the last significant digit of the original image
– Watermark was extracted by taking the least significant bits at specific locations
– Detection was done by cross correlation of the original and extracted watermarks
• Discrete Cosine Transform (DCT)
– Watermark was placed in perpetually significant areas of the image
– Watermark based on 1000 random samples of a N(0,1) distribution
– Sample was added to the 1000 largest DCT coefficients of the image
– Inverse DCT was taken to retrieve the watermarked image
– For detection watermark was extracted from the DCT of suspected image
• Discrete Wavelet Transform(DWT)
– Watermark modeled as Gaussian noise was added to middle and high frequency bands of the image
– Decoding process involved taking DWT of potentially marked image
• Fractal Codes
– A collage map was composed from 8x8 blocks of original image and from image’s DCT
• Perceptually inaudible,
– such that no perceptual quality degradation occurs
• Statistically undetectable
– To ensure security
• Cannot be removed or modified by any signal processing operation (e.g. filtering, compression, MP3-encoding,...) without degrading perceptual quality
• Readily extractable to detect copyright information
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