Steganography Ppt 5j5i6n

Steganography

B Y: K ira n G . K . 1 v k 0 6 e c0 3 0

Introduction :  Advance security is not maintained by the protection but it is gained by hiding the existence of the data, which can only be done by Steganography.  Steganography is a subject which is rarely touched upon by most IT Security Enthusiasts .  Steganographic Systems can hide messages inside of Digital Objects such as a file that has been concealed inside a Digital Picture, Video or Audio file.  The main advantage of Steganography is, it hides the information in such a way that there is no information hidden at all.  This is derived from the 

name of

lizard “Stegosaurs”.

History of Steganography : 4 4 0 B . C .  Histiaeus shaved the head of his most trusted slave

and tattooed it with a message which disappeared after the hair had regrown. To instigate a revolt against Persians.

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1 st and 2 nd World Wars  German spies used invisible ink to print very small

dots on letters.  Microdots – Blocks of text or images scaled down to the size of a regular dot. 

Current  Special inks are used to write a hidden messages

on bank notes.

Evolution :

Etymology : It comes from the Greek words :         



Definition :

Steganography is the art and science of hiding the fact that communication is taking place. 

What is Steganography ? 

Steganography is the practice of hiding private or sensitive information within something that appears to be nothing out of the usual. 

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.

Steganography Carrier or Cover File – A Original message or a file in which hidden information will be stored inside of it . Stego - Medium– The medium in which the information is hidden. Embedded or Payload – The information which is to be hidden or concealed. Steganalysis – The process of detecting hidden information inside a file.

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Types of Steganography S te g a n o g ra p h y In Te x t/ D o cu m e n ts  Steganography In Images  Steganography In Audio  Steganography In Video 

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Steganography in Text Lin e S h ift C o d in g : Lin e s a re ve rtica lly sh ifte d W o rd S h ift C o d in g : C o d e w o rd s a re H o rizo n ta lly sh ifte d Fe a tu re C o d in g : C o d in g d o n e u sin g ce rta in text fe a tu re s A lte rn a tive M e th o d s  S yn ta ctic M e th o d s  S e m a n tic M e th o d s  

Tools :- wbStego 

Steganography In Images Le a st S ig n ifica n t B it In se rtio n

C o m m o n a n d S im p le A p p ro a ch M a skin g a n d Filte rin g  M a rk a n im a g e in a m a n n e r sim ila r to p a p e r w a te rm a rks A lg o rith m s a n d Tra n sfo rm a tio n s  D CT  FFT  W a ve le t Tra n sfo rm 

Tools :- JPHide and JPSeek

Steganography In Audio Low bit encoding method is used to hide information inside audio files which is some what similar to LSB that is generally used in Images. Spread Spectrum is another method used to conceal information inside of an audio file. This method works by adding random noises to the signal the information is conceal inside a carrier and spread across the frequency spectrum. 

Steganography In Audio Echo Data Hiding 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 echo inside an audio file, information can be concealed. The thing that makes this method of concealing information inside of audio files better than other methods is that it can actually improve the sound of the audio inside an audio file.

Tools :- mp3stego 

Steganography in Videos S te g a n o g ra p h y in V id e o s is sim ila r to th a t o f S te g a n o g ra p h y in Im a g e s, a p a rt fro m in fo rm a tio n is h id d e n in e a ch fra m e o f vid e o . W h e n o n ly a sm a lla m o u n t o f in fo rm a tio n is h id d e n in sid e o f vid e o it g e n e ra lly isn ’ t n o tice a b le a t a ll, h o w e ve r th e m o re in fo rm a tio n th a t is h id d e n th e m o re n o tice a b le it w ill b e co m e . 

Tools :- msu StegoVideo

How it works : In this our original data is embed with the

carrier file to form STEGDATA.

Example:

D e te ctin g S te g a n o g ra p h y :  The art of detecting Steganography is referred to as

Steganalysis.

 Using different tools like sendsecret, Steganography 8.1 , Stegdetect, Hiderman etc.  Steganalysis does not deal with trying to decrypt the hidden information inside of a file, just discovering it.  It is mainly done with comparing the encrypted file with the original copy.  It can be done through Histogram technique. 

Information hidden behind the image.

Detecting By histogram technique :

Applications in Modern Printers  Used in HP and Xerox brand color Laser

Printers. Tiny Yellow dots are added to each page. The dots are barely visible and contain Encoded printer serial numbers, as well as date and time stamps.

Machine ID codes in laser printers

See http://www.eff.org/Privacy/printers/

Machine ID codes in laser printers

Machine ID codes in laser printers

Machine ID codes in laser printers

A d va n ta g e s :  It is used in the way of hiding not the

Information but the to reach that Information.  Difficult to detect .Only receiver can

detect.  Can be applied differently in digital

image, audio & video file.  It can be done faster with the large no

of software's.

D isa d va n ta g e s :  Huge number of data = huge file size, so

some one can suspect about it.  In sending and receiving information can

be leaked.  The confidentiality of information is

maintained by the algorithms, and if the algorithms are known then its all over.  If this technique is gone in the wrong

hands like hackers, terrorist ,criminals then this can be very much dangerous for all.

C o n clu sio n :  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 be replaced by Steganography.  If it gets in the hand of terrorist then it could be even worse than WTC Attack in which steganography was used.

Bibliography www.wikipedia.org http://zone-h.org h ttp :// w w w . e ffo . rg / Priva cy / p rin te rs/ N . p ro vo s & P. H o n e ym a n , “ H id e & S e e k : A n

In tro d u ctio n to S te g a n o g ra p h y ,” IE E E S e cu rity a n d p riva cy D . A rtz, “ D ig ita lS te g a n o g ra p h y: H id in g D a ta w ith in D a ta ,” IE E E S e cu rity a n d Priva cy  

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