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STEGANOGRAPHY- An Art of Hiding Digital Information

Jun 02, 2018

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    Group Members:

    Divya Singhvi- WRO0443467Sri Sharma- WRO0442354

    Center Name: RVG, Andheri

    Batch Timing: 3 to 6

    Batch Commencement Date: 25thJune 2013

    Group Leader

    Name:

    Contact Number:

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    STEGANOGRAPHY- AnArt of hiding digital

    information.

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    We chose this topic because when we were

    taught Digital Signature in class, we found

    encryption and decryption to be a really

    interesting topic. Hence we chose

    steganography as the topic for ourassignment as it would allow us to learn

    more about the whole process.

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    Introduction

    The word Steganography is derivedfrom two Greek words Steganos

    Grahpei.

    It means Concealed Writing

    It is the art of hiding messages in such

    a way that no one but the sender and

    the intended recipient knows about thevery existence of the message.

    It is different from cryptography.

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    Objectives of Steganography

    Cryptography the science of writing

    in secret codes cryptography does

    not always provide safe

    communication.

    Steganographyis the science of hiding

    information. Its goal is to hide the

    data from a third party.

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    Example of a coded text-

    Apparently Neutrals protest is

    thoroughly discounted and ignored.

    Isman hard hit. Blockade issue affects

    pretext for embargo onby-products,ejecting suet and vegetable oil.

    Contains a coded message-

    Pershing sails from NY June 1

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    The steganographic process:

    Cover Medium Hidden data Stego Key

    Stego Medium

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    Steganography primarily uses threemediums for hiding information i.e.

    Text, Image and AudioA. Text-

    1. Line Shift Coding- Shifted vertically,

    most visible but difficult to cipher2. Word Shift Coding- Shiftedhorizontally, very difficult to detect.

    3. Feature Coding- Certain letters orcharacters are altered, horizontally orvertically.

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    B. Image-

    1. Images are used as they can hide

    large amounts of data.2. Three methods of hiding data is Least

    Significant bit, Masking and filtering

    data, and algorithms &transformations

    a. LSB- Takes the two least significantbits and replaces it with data, it is

    the most detectable method as thecolor of the image changes

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    b. Masking and Filtering- a pattern of bits

    in inserted into an image to identify the

    author, rights etc. Steganographyconceals this information, watermarking

    scatters the bit so that it cannot be

    manipulated

    c. Algorithms & transformation-

    Transmitting narrowband signal over a

    larger bandwidth so that the spectral

    density looks like its noise or change

    luminance or divide bandwidth into

    many sections.

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    C. Audio-

    Low bit encoding method is used to

    hide information inside audio fileswhich is somewhat similar to LSB thatis generally used in Images.

    Spread Spectrum is another methodused to conceal information inside ofan audio file. This method works byadding random noises to the signal the

    information is concealed inside acarrier and spread across thefrequency spectrum.

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    Echo Data Hiding

    It is yet another method of hiding

    information inside an audio file.This method uses the echoes in sound files

    in order to try and hide information.

    By simply adding extra sound to an echoinside an audio file, information can be

    concealed. The thing that makes this

    method of concealing information inside ofaudio files better than other methods is

    that it can actually improve the sound of

    the audio inside an audio file.

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    Advantages

    The advantage of using steganographyis to conceal information. With the useof steganography and encryption,corporations, governments, and law

    enforcement agencies can communicatesecretly.

    Encryption protects data and can bedetected; the only thing missing is thesecret key for decryption.Steganography is harder to detect undertraditional traffic-pattern analysis.

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    Disadvantages

    One of the biggest disadvantages is that quite

    frequently the size of a stegnated image is

    usually larger that the original image. There

    can be colour changes, especially evident if

    well-know images are chosen as thesteganographic cover. Images can be

    degraded when trying to analyze them.

    Text messages are limited in size for thehiding of data. They need redundant data to

    replace a secret message. Thus changing the

    type of the format or replacing the readable

    text can alter text messages.

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    Disadvantages

    Some Internet firewalls can detect

    steganographic messages. As this

    technology evolves detecting

    steganographic messages can be adrawback because an important

    message may be deleted or

    quarantined and this message may bethe one that will save a country.

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    Legitimate Uses

    Digital Watermarking: Prevent illegalmodification, copying, distribution.

    Used to hide the existence of

    sensitive files on storage media.

    Illegitimate Uses

    Corporate Espionage: Theft of trade secretsTerrorism

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    Conclusion

    Though steganography is not

    implemented in wider ways but it can

    be the best security tool.

    The main problem of today's world is

    to secure their data confidentially, the

    techniques used currently are not

    considered the best which can only bereplaced by Steganography.

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    Bibliography

    http://citeseerx.ist.psu.edu/viewdoc/downloa

    d?doi=10.1.1.9.9717&rep=rep1&type=pdf

    http://www.slideshare.net/

    http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.9.9717&rep=rep1&type=pdfhttp://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.9.9717&rep=rep1&type=pdfhttp://www.slideshare.net/http://www.slideshare.net/http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.9.9717&rep=rep1&type=pdfhttp://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.9.9717&rep=rep1&type=pdf
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