Monoalphabetic Substitution Cipher in which every alphabet have unique alphabet and we can not use same for another alphabet in cipher text. Polyalphabetic cipher was invented by Johannes Trithemius in the 15th Century. To remove this limitation, Polyalphabet cipher is introduced in which we can use alphabet for any number. […]
Monoalphabetic Substitution Cipher: It also known as substitution cipher. Replacement of alphabets or digits are fixed for each letter. For example: Plain text : nikhilarora Cipher text: OJLIMBSPSB In the above example, the value of ‘a’ is fixed for every time as ‘B’ and every alphabet is fixed for separate […]
Basic Terms to be used : plaintext – It is a kind of original message ciphertext – It is a type of coded message cipher – An algorithm to be performed for transforming plaintext/ciphertext. key – The information used in cipher known only to sender and receiver. encipher (encrypt) – […]
