Introducing 

Prezi AI.

Your new presentation assistant.

Refine, enhance, and tailor your content, source relevant images, and edit visuals quicker than ever before.

Loading…
Transcript

Advantages and Disadvantages

Advantages

  • Has a better mixing of letters than some ciphers. (Rail Fence Cipher)
  • The main benefit that transposition cipher have over substitution cipher is that transposition cipher can be applied more than once. (This is the Double Transposition.)

Disadvantages

  • Can easily be deciphered if it was a small message.

Irregular Case

Double Column Transposition

  • The only difference between regular and irregular columnar transposition is that instead of random letters you put blanks.
  • Double column transposition takes the already encrypted text and cipher it again using a different keyword. This makes decrypting the text extremely difficult.
  • This transposes the columns twice.

In this picture, the highlighted part is where the random letters would be if it was a Regular Case.

Citation

  • http://practicalcryptography.com/ciphers/columnar-transposition-cipher/
  • http://www.braingle.com/brainteasers/codes/columnartrans.php
  • http://crypto.interactive-maths.com/columnar-transposition-cipher.html

Introduction

Regular Case

  • Any Spare spaces are filled with nulls / random letters
  • Use your messages and write them in rows of fixed length
  • Messages read out column by column
  • Three Different types of Columnar

Regular, Irregular And Double

  • Both the width of the rows and the permutation of the columns are usually defined by a keyword
  • The permutation is defined by the alphabetical order of the letters in the keyword

Columnar Transposition

Learn more about creating dynamic, engaging presentations with Prezi