In this post, I will explain classical encryption techniques Ceasar cipher, Monoalphabetic cipher, and Playfair cipher, and provide a java code demonstrating encryption and decryption processes for each one.
Design pattern is best practise and a proper solution to a problem faced by software developers this solution based on two principles of object oriented design . 1- Program to an interface not an implementation. 2- Preferring object composition over class inheritance.