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- Authors : Sushant Mangasuli, Sneha K N, Arundhati Nelli, Suraksha R B
- Paper ID : IJERTCONV7IS08060
- Volume & Issue : RTESIT – 2019 (VOLUME 7 – ISSUE 08)
- Published (First Online): 13-06-2019
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A Framework for Efficient and Secure Information Transform by using LSB and Diffie Hellman Algorithm
Assistant Professor, Alvas Institute of Engineering and Technology Moodbidri, India
Assistant Professor, KLS Gogte Institute of Technology, Belagavi, India
Sneha K N3
Alvas Institute of Engineering and Technology Moodbidri, India
Suraksha R B4
Alvas Institute of Engineering and Technology Moodbidri, India
Abstract: Steganography is hiding private or secret data within a carrier in invisible manner. The medium where the secret infor- mation is secreted is called as cover medium which can be an im- age, an audio or video file. Any stegno algorithms removes the re- dundant bits in the secret media and adds the secret data into that media. As the quality of video or sound is higher, more redundant bits are accessible for hiding. To make available secure communi- cation between the users by using the video Steganography is used. Here to provide a secure transfer of the data in the military infor- mation using video Steganography by applying the Diffie- Hellman algorithm used for key generation and LSB matching revised al- gorithm this method creates a directory for the secret information and the directory is placed in a frame of the video itself. By means of the help of this directory, the frames containing the secret infor- mation are found. Henceforth, during the de-embedding process, instead of analysing the whole video, the frames containing the se- cret information are analysed with the help of index at the receiv- ing side. This both techniques used for encrypt and decrypt the data.
Keywords: Information security, Steganography, key generation.
Steganography is the practice of hiding information in plain sight. This technique relies on a message being encoded and hidden in a transport layer in such a way as to make the pres- ence of the data is unknown to an observer. Importantly, the transport layer the carrier file – is not secret and can therefore be viewed by observers from whom the secret message itself should be concealed. The influence of steganography is in hid- ing the secret data by obscurity, hiding its presence in a non- secret file. In that sense, steganography is unlike from cryptog- raphy, which comprises of making the content of the secret data unreadable while not avoiding non-intended observers from learning about its presence. Because the success of the tech- nique depends completely on the ability to hide the data such that an observer would not doubt that secret data is there at all, the highest effort is essential for ensuring that the message is invisible unless one knows what to look for. The way in which
this is done will differ for the specific media that are used to hide the information [1,2].
In each case, the value of a steganography approach can be measured by how much data can be hidden in a medium before it becomes detectable, each method can thus be assumed of in terms of its capacity for data hiding. There are numerous methods used to hide data inside of Image, Audio and Video files. The desire to transfer the message as securely as possible has remained the main idea of discussion since many years. Data is the treasure of any organization. This leads to security- issues topmost importance to any organization dealing with pri- vate data. Any of the method we choose for the security pur- pose; the only concern is the rate of security .
Steganography is the art of covered or hidden writing. The purpose of this technique is secret communication to hide a message from a non-intended user. Steganography is fre- quently confused with cryptology as the two techniques are similar in the way that they both are used to secure the secret data. The difference among these are that Steganography in- cludes hiding data, so it looks as if that no data is secreted at all. If a non-intender user tries to view the object that the data is hidden inside of, he or she will have no knowledge that there is any hidden data, hence the person will not attempt to decrypt the data. 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 [4,5].
What Steganography basically does is exploit human perception; human minds are not trained to look for files that have data concealed inside them. Normally, in steganography, the actual data is not maintained in its unique format and in that way it is transformed into an another equivalent multimedia file like image, video or audio which in shot is being concealed within alternative object. This apparent data (known as cover text) is sent through the network to the recipient, where the ac- tual data is separated from it .
A study Of Steganography and Art of information Hiding. Steganography is technique that hides the secret data within text, image, audio, or video file. It is often confused with the term cryptography. The easiest method to distinguish in the two is to think of Steganography not only hides content of data but also the mere presence of data. Unlike other methods of ste- ganography are discovered. A new term came into knowledge called Steganalysis. Steganalysis is a technique to spot presence of a hidden data and attempt to reveal the true content of the data. This study demonstrates various components of steganog- raphy which is said in the report. The research discovers set of rules applied to preserve planned results which is non-visible secret data with a cover information. Paper enlightens applica- tion of steganography in defense, government purpose .
The main goal of this method is to hide information on the output image of the instrument (such as image displayed by an electronic advertising billboard). This technique can be used for declaring a secret data in a public place. In wide-range, this technique is a kind of steganography, but it is completed in real time on the output of a device such as electronic billboard.
Following are the stages involved in inserting the secret data within a cover media.
Send the regular data that must be displayed to the display board.
With a suitable Steganography algorithm secure the secret data within the normal data before moving it to the display board. This technique can be used for declaring a secret data in public place. It can be prolonged to other means such as elec- tronic advertising board around sports stadium.
Performance improving LSB video steganography.
The proposed technique is enhanced version of the LSB tech- nique used for audio steganography, united with coding tech- nique gives high embedding capacity with reference to litera- ture survey LSB technique provides best outcomes hence con- sidered for execution. The present steganography methods take assistance of renowned cryptography algorithms to rise security level. But our proposed technique uses additional coding tech- nique. The data to be embedded is initially changed to decimal then converted to binary. Later it is converted to matrix where there are rows equal to total no of character to be embedded. Then that matrix is transformed to column matrix. In addition, then each bit is embedded into LSB of each audio example. When inserting the textual data in any audio folder, initial the audio sign is converted into bits. Then the data to be embedded is transformed from above approach. By applying LSB algo- rithm, the data is embedded into audio sample read t 16-bit format.
The proposed technique is enhanced version of the LSB technique used as audio steganography, combined with
coding technique provide high embedding capacity. Listening test is accepted to find Minimum Opinion Score (MOS) which satisfies imperceptibility value. Text Intelligibility Index (TII) demonstrates 100% accurate extraction of the embedded text, for different message length, which varies from 16.5 kbps min- imum to 97.6 kbps maximum length of messages. Time domain representation of original and stego signals show dissimilari- ties, but the effect of these dissimilarities is inaudible when the two audio signals heard separately. Proposed method is applied to various audio, speech and music envelope signals and it gives best outcomes satisfying steganography idea .
limits of Steganography
This paper discovered the restrictions of steganographic theory and practice. We started outlining several techniques both an- cient and modern, collected with attacks on them (some new); we then discussed several probable methods to a theory of the subject. We pointed out the difficulties that stand in the way of a theory of perfect surreptitiousness" with the same power as Shannon's theory of perfect secrecy. But considerations of en- tropy give us roughly quantitative leverage and the selection channel the bandwidth of the stego key led us to suggest em- bedding information in parity checks rather than in the data di- rectly. This approach gives improved efficiency, and also al- lows us to do public key steganography. Finally, we have re- vealed that public key steganography may be likely in the pres- ence of an active warden.
A new perspective of LSB image steganography tech- nique is presented. The main idea behind this technique is treat- ing the contents of the secret data as a set of words instead of as a set of characters. And using a exact words dictionary, at the sender and the receiver of the secret message, to mean each word in the secret data as a number and concealed the bits of these numbers in the Least Significant Bit (LSB) of the pixels in the stego- image .
This will give the subsequent strong facts to Word-Based LSB technique.
Improve extra security to the secret message.
Rises the capability of hiding very long secret data in a small stego-image.
Decrease the noise that is appearing in the stego-image be- cause the change that may happen in the LSB of the pixels in the stego-image.
Lessen the time that is required to hide and extract the secret data.
The existing system of Video Steganography stances more lim- its on the selecting of video files. User can select only wav files to encode. It supports water marking method to encode. Its
complexity arises when more message to be encoded. The mes- sage length is restricted to 500 characters. It doesnt show the variations occurred after encoding the message. The LSB algo- rithm in the present system is not effective because it hides the message in consecutive bytes received from video files.
The existing systems want moral user interface, non-provision of selecting the key and additional encode-decode time con- sumption. There are bags of steganographic programs accessi- ble. A few of them are brilliant in every respect; unfortunately, most of them lack usable interfaces, or comprise too many bugs, or unapproachability of a program for other operating systems. The proposed application will yield into account these limita- tions, operability over numerous operating systems and even over different hardware platforms would not be a problem. This proposed stego machine provides easy method of implementing the methods. The idea behind this design is to provide a good, efficient method for hiding the data from hackers and sent to the destination securely.
DiffieHellman key exchange creates a shared secret amongst two parties that can be used for secret communication for ex- changing information over a public network. The conceptual diagram to the right illustrates the general idea of the key ex- change.
In this module the user takes the video and the text message as two different input.
LSB Encryption module
In this module initially, the user video that would be converted to stegno video is split into the multiple frames and audio. Each frame contains bits where message bits are added into it using the LSB. The LSB bits are used because they do not form any modification of color as much like MSB bits. Then the messages are encrypted into frames of the images. Then each of the frames are converted into stegno frames. Then the merging of frames and audio takes place to form a complete stegno video.
Least significant bit (LSB) insertion technique is ac- curately what it sounds like; the least significant bits of the cover-image are changed so that they form the embedded infor- mation. 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) and assume data is
A: 01000001 Then the final Result is: (00100110 11101001
11001000) (00100110 11001000 11101000) (11001000
00100111 11101001). The three featured bits are the only three bits that were essentially altered. LSB insertion wants on aver- age that only partial the bits in an image be altered. Since the 8- bit letter A only needs eight bytes to hide it in, the ninth byte of the three pixels can be used to begin hiding the next character of the hidden information.
Key generation and exchange module
In this module the generating of prime numbers takes place. Then the Diffie-Helman Key exchange algorithm is computed. This algorithm generates secret key that has to added to the stegno video. The stegno video and the secret is added to the stegno video and directed to the legitimate user through the mail.
Figure 1: System Architecture
Fig. 2 explains how key exchange algorithm works. The only problem was "If the attacker knows the common paint and he knows the end mixtures, why can't he figure out the orig- inal color?". The answer is of course that it's not the color he needs to know, but the actual original mixture, and as we men- tioned, the mixture separation is expensive.
Figure 2: Key exchange mechanism
In this module the decryption of the steno video by using the secret key. Finally, the video and the secret message can receive by the user. Then the message is decrypted from the bit frames of the stegno video.
By analyzing the algorithm and the method used in this paper the user can get the secret message that is encrypted in a video. The video has frames where each bit contains secret message combined to get a stegno video. The stegno video is sent from one end to another end through the communication channel. Here an algorithm is used where a secret key is added to make a secure transfer of the stegno video. The secret messages are hidden in the video that is received in another end by using the secret key. Then the video is separated from secret key and the stegno video is decrypted to obtain the secret message sent by the sender.
Figure 3(a) Before image encryption
Figure 3(b) after image encryption
The proposed technique is useful technique for protected com- munication over any medium. In the process of Steganography, the message which is hidden is invisible. An effort has been tried to implement encryption and decryption procedures on the information to be hidden into the video, so that this will bring additional safekeeping of the dat. The main advantages of LSB are its simplicity to insert the bits of the data straight into the LSB plane of cover-image and many procedures use these ap- proaches. Modulating the LSB does not result in a human-per- ceptible alteration because the amplitude of the alteration is mi- nor. The sender and receiver only know how to hide and unhide the data into the video. No other intermediate person will even know that there is a second message inside the carrier file. The enhanced LSB technique described in this project helps to fruit- fully hide the secret data into the cover object without any mis- representation. The data hiding capacity of LSB technique is high and more secure. Embedding secret information with Ste-
ganography technique decreases the probability of secret infor- mation being detected and also allows high perceptual transpar- ency.
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