Cryptography concepts and techniques
- 44. 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.
- 45. Steganography terms 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.
- 46. Types of Steganography • Steganography In Text/Documents • Steganography In Images • Steganography In Audio • Steganography In Video
- 47. Steganography in Text Line Shift Coding: Lines are vertically shifted Word Shift Coding: Codewords are Horizontally shifted Feature Coding: Coding done using certain text features Alternative Methods Syntactic Methods Semantic Methods Tools :- wbStego
- 48. Steganography In Images • Least Significant Bit Insertion Common and Simple Approach • Masking and Filtering Mark an image in a manner similar to paper watermarks • Algorithms and Transformations DCT FFT Wavelet Transform Tools :- JPHide and JPSeek
- 49. 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.
- 50. 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
- 51. Steganography in Videos Steganography in Videos is similar to that of Steganography in Images, apart from information is hidden in each frame of video. When only a small amount of information is hidden inside of video it generally isn’t noticeable at all, however the more information that is hidden the more noticeable it will become. Tools :- msu StegoVideo
- 52. Advantages : • It is used in the way of hiding not the Information but the password 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.
- 53. Disadvantages : • 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.