Simple columnar transposition technique is an example of transposition technique.

Steps for Simple columnar transposition technique are as follow.

  1. Write the plain text message row-by-row in grids of rectangle of a pre-defined size.
  2. Read the message column by column. However, it need to be in the order of column 1,2,3,4,5,6 etc. It can be any random order such as 2, 6, 4, 3, 5, and 1.
  3. After this operation message obtain is cipher text message.
  4. Simple columnar transposition technique simple arranges the plain text as a sequence of row of rectangle that is read in column randomly.
  5. Simple columnar transposition technique is also quite simple to break after trying some permutation combinations of column orders to get original plain text. To make this encryption more complex we can perform more than one round of transposition using same technique.
  6. Let’s see an example. Suppose we have plain text HELLO YOU ARE READING THIS ON MY BSC IT. If we perform Simple columnar transposition technique operation on this text in column order of 2, 6, 4, 3, 5, and 1 then encrypted text will be EUAHYYRGNILRISSLADIBOENOCHOETMT .



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