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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.

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Mono 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. Replace each alphabet with a specified number down.Īs Caesar cipher and a modified version of Caesar cipher is easy to break, monoalphabetic cipher comes into the picture.So here, the plain text is EDUCBA, and ciphertext Is FEVDCB.Ī modified version of the Caesar cipher algorithm is as follows. For example, EDUCBA and number for the replacement are 1, so E will replace by F, D will replace by E, U will replace by V, C will replace by D, B will replace by C, and A will replace by B. Repeat the process for all alphabet in plain text.Ī Modified Version of Caesar Cipher: This cipher works the same as Caesar cipher the only difference is – in Caesar cipher, each alphabet is replaced by three-place down wherein a modified version of Caesar cipher, a user decides the number to replace the alphabet, and this number will be constant.Replace each alphabet with 3 places down.So here the plain text is EDUCBA and ciphertext Is HGXFED. As a Caesar cipher, each alphabet is replaced by three-place down so that E will replace by H, D will replace by G, U will replace by X, C will replace by F, B will replace by E, and A will replace by D. In Caesar’s cipher, each alphabet in the message is replaced by three places down. It is a very weak technique of hiding text. In Caesar cipher, the set of plain text characters is replaced by any other character, symbols or numbers.

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