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Blog

Stegnography Basics

5/10/2017

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What is Steganography?
Hiding a secret message within an ordinary message and extracting it at the destination to maintain confidentiality of the data.
Example: Popular method is hiding a file inside an image or using image file as a cover.
http://www.wikihow.com/Hide-a-File-in-an-Image-File
Techniques:
  • Substitution Techniques
  • Transform Domain Techniques
  • Cover Generation Techniques
  • Spread Spectrum Techniques
  • Distortion Techniques
  • Statistical Techniques
Classification:
Technical Steganography:
Uses physical and chemical means to hide the existence of a message.Example – Invisible ink, Microdots, In Computers (Uses redundant information in pictures, text, sound etc)
Linguistic Steganography:
Uses written natural language to hide the message in the carrier in some non-obvious ways.
  1. Semagrams – Uses visual symbols or signs. Further classified into visual(Eg Doodles) or Text semagrams (small changes in font size, color etc)
  2. Open codes – Hide in a specifically designed patter – unclear to the normal user.
    1. Jargon Code- Only a group of people  can understand
    2. Covered Ciphers (Null Ciphers and Grille Cipher): Hidden openly in the carrier medium.
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