What is Confusion? | What is Diffusion? | Claude Shannon Properties | Frustrate Statistical Cryptanalysis | Confusion vs Diffusion

Introduction

There are two basic methods of encryption:

 

A Shanon cipher, invented by its name "Claude Shannon". It is simplified cipher mechanism for encrypting mesaage using a shared secret key. A cipher is generally an algortihm for performing encryption or decryption, i.e., "a series of well-defined steps that can be followed as a procedure".

Properties of Claude Shannon

Confusion

It is a technique of ensuring that a cipher text gives no clue about plain text.

It is used in block and stream cipher method.

Achieved by Substitution technique.

Ex: ABC à XYZ

Diffusion

Increases the redundancy of the plain text by spreading it across rows and columns.

It is used in block cipher method.

Achieved by permutation known as Transposition technique.

Ex: ABC à CAB

It is also known as frustrate statistical cryptanalysis.

Difference between Confusion and Diffusion

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