Hill Cipher | Complete Algorithm with Example | Hill Cipher Encryption and Decryption | Hindi Urdu

#askfaizan | #syedfaizanahmad Playfair Substitution Cipher : https://youtu.be/w_xr7pj-O6c Monoalphabetic Substitution Cipher : https://youtu.be/Hw1T7GOnVW0 Caesar Cipher | Caesar Substitution Cipher : https://youtu.be/2N9GlhysYJw PlayList : Cryptography and Network Security : https://www.youtube.com/playlist?list=PLhwpdymnbXz7hvvqhqjIIG4tEdhAgQqll Hill Cipher was Invented by Lester S. Hill in 1929 Like the other Digraphic Ciphers, it acts on groups of letters Unlike the others it is extendable to work on different sized blocks of letters Hill Cipher uses an area of mathematics called Linear Algebra Some important concepts are used throughout: Matrix Multiplication, Modular Inverses, Determinants of Matrices, Matrix Adjugates Hill cipher Encryption : Turn keyword into a key matrix (2x2 for Digraphs) Turn the plaintext into digraphs Turn each digraphs into a column vector. Then perform matrix multiplication modulo 26 on each vector These vectors are then converted back into letters to produce the ciphertext. Hill cipher Decryption : Turn keyword into a Inverse key matrix (2x2 for Digraphs) Turn the ciphertext into digraphs Turn each digraphs into a column vector. Then perform Inverse key matrix multiplication modulo 26 on each vector These vectors are then converted back into letters to produce the plaintext.