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Stegnography
- 1. AUDISANKARA COLLEGE OFENGINEERING AND TECHNOLOGY DEPARTMENT OF CSE A TechnicalSeminar on STEGANOGRAPHY Presented by A.Keerthi Yadav 12G21A0505
- 2. Overview Introduction History Problem statement Objective of the study Scope Steganography techniques LSB algorithm Design phase Snapshots Results and discussion Conclusion and further enhancement References
- 3. INTRODUCTION Steganography comesfrom Greek word which means covered or secret writing. Stegan means covered, graphy means writing
- 4. Continue “The goalof steganography is to hide messages in such a way that no one apart from the intended recipient even knows that a message has been sent.” This can be achieve by concealing the existence of information within seemingly harmless carriers or cover It can be understand by the following figure.
- 5. History The firstrecorded uses of steganography can be traced back to 440 BC when Herodotus mentions an example of steganography in the histories of Herodotus. Ancient example is that of histories, who shaved the head of his most trusted slave and tattooed a message on it. After his hair had grown the message was hidden. The purpose was to instigate a revolt against the Persians.
- 6. Problem Statement Howcan we send a message secretly to the destination. Using steganography, information can be hidden in carriers such as images, audio files, text files, videos and data transmissions. In this study, I proposed a new framework of an image steganography system to hide a digital text of a secret message.
- 7. Objective of theStudy Here primarily concentrated on the data security issues when sending the data over the network using steganographic techniques. The main objectives of the project are: Requirement of this steganography system is that the hider message carried by stego-media should not be sensible to human beings. The other goal of steganography is to avoid drawing suspicion to the existence of a hidden message. This approach of information hiding technique has recently become important in a number of application areas.
- 8. Scope The scopeof the project is to limit unauthorized access and provide better security during message transmission. To meet the requirements, we use the simple and basic approach of steganography. In this project, the proposed approach finds the suitable algorithm for embedding the data in an image using steganography which provides the better security pattern for sending messages through a network. For practically implementing the function of the discussed algorithms, Microsoft .NET framework is used.
- 9. Steganography Technique Pure steganography:Pure steganography is the process of embedding the data into the object without using any private keys. This type of steganography entirely depends upon the secrecy. This type of steganography uses a cover image in which data is to be embedded, personal information to be transmitted, and encryption decryption algorithms to embed the message into image.
- 10. LSB Algorithm LSB(Least Significant Bit) substitution is the process of adjusting the least significant bit pixels of the carrier image. It is a simple approach for embedding message into the image. The Least Significant Bit insertion varies according to number of bits in an image. For an 8 bit image, the least significant bit i.e., the 8th bit of each byte of the image is changed to the bit of secret message. For 24 bit image, the colors of each component like RGB (red, green and blue) are changed. LSB is effective in using BMP images since the compression in BMP is lossless
- 11. How LSB Works Structureof text file: Any text file consists of streams of characters , each character is 1 byte (ASCII code) each byte as all of us of course know consists of 8 bits .
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- 13. Design Phase Start Application Encryption Decryption Imagefile BMP image file Image Message file Image Messagefile Figure: Block diagram for Steganography
- 14. Continue ENCRYPTION PHASE: The “Encryptionphase” uses two types of files for encryption purpose. One is the secret file which is to be transmitted securely, and the other is a carrier file such as image. In the encryption phase the data is embedded into the image. Figure: Encryption Phase Process
- 15. Continue DECRYPTION PHASE: The Decryptionphase is reverse to encryption phase. In decryption phase, the carrier image in which the data is hided is given as an input file. decryption section uses the “Least Significant bit Algorithm” (LSB) by which the encoded bits in the image is decoded and turns to its original state and gives the output as a text document. Figure: Decryption Phase Process
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- 22. Results and Discussion In this project I mainly concentrated on embedding the data into an image such that the image is protected and the data to the destination is sent securely. The speed of embedding the data into the image is also high in the proposed approach There are many steganographic algorithms available like JSteg, F5 and LSB algorithms. But we used the Least Significant Bit algorithm in designing the steganographic application because LSB algorithm works efficiently. The speed of embedding is also high when using LSB compared to the JSteg algorithm.
- 23. Conclusion In thepresent world, the data transfers using internet is rapidly growing because it is so easier as well as faster to transfer the data to destination. So, many individuals and business people use to transfer business documents, important information using internet. Security is an important issue while transferring the data using internet because any unauthorized individual can hack the data and make it useless or obtain information un- intended to him.