Enter the keyword in the matrix in a row-wise manner, i.e.It uses a 5 * 5 matrix to store the keyword or the key, which is used for the encryption and decryption process. Let’s discussed the above-mentioned steps in detail manner creation and population of the matrix. The Playfair cipher process is as follows: It is a cryptographic technique that is used o encrypt the data. Playfair cipher is also called Playfair square. The final encryption of Educba is Esjnfa. The rest of the original text is enciphered in the same way. Similarly, for the second letter of the original text, the second letter of the key is used, the letter at row d and column p is s. So use row E and column A of the Vigenère square, which is E. For the encryption process, E is paired with A, the first letter of the original text, E, is paired with A, the first letter of the key. Let’s consider Original text is Educba, and the keyword is Apple. The cipher uses a different alphabet from one of the rows at various points in the encryption process. The table contains 26 alphabets written in different rows each alphabet is cyclically shifted to the left according to the previous alphabet, equivalent to the 26 possible Caesar Ciphers. Vigener square or Vigenere table is used to encrypt the text. It uses multiple substitution alphabets for encryption. In Polyalphabetic Substitution, Cipher is a method of encrypting alphabetic texts. Polyalphabetic Cipher is also known as Vigenere Cipher, which Leon Battista Alberti invents. In this type of ciphers, plain text replacement is done through the block by block rather than character by character. In this case, EDUCBA will replace with XYQLAB, but EDU can be replaced with another set of the block, let’s assume EDU will replace with LOD. In polygram substation cipher, rather than replacing each alphabet with another, the alphabets’ Block is replaced with another block of alphabets. or replace A with E, x or L, B with T, A, Z, etc. For example, replace A with x, E with B, S with A, etc. The substitution alphabet is replaced with te fixed. Homophonic Substitution CipherĪ homophonic substitution cipher is similar to a monoalphabetic cipher the only difference is in monoalphabetic, we replace the alphabet with any other random alphabet except the original alphabet wherein homophonic substitution cipher, the alphabet is replaced by fixed alphabet or set of alphabet. #Cipher text crackMono alphabetic cipher causes difficulty to crack the message as there are random substitutions and a large number of permutation and combination are available. C can be replaced by A, B, and D to z, etc. That is, A can be replaced by any other alphabet from B to Z. In monoalphabetic, each alphabet in plain text can be replaced by any other alphabet except the original alphabet.
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