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#SUBSTITUTION CIPHER DECODER CRACK#

Organize the plain text message as a matrix of numbers based on the above step in number format.

Assign the number to each alphabet in plain text.

Hill cipher works on multiple alphabets at the same time.

If both the alphabet in the group are not in the same row or column, replace them with the alphabets in the same row immediately but at the other pair of corners of the rectangle, which the original group defines.

If the original group is on the bottom side of the row, then wrapping around to the row’s top side happens.

If both the alphabet in the group are present in the same column, replace them with the alphabets immediate with below, respectively.

If the original group is on the right side of the row, then wrapping around to the row’s left side happens.

If both the alphabet in the group are present in the same row of the matrix, replace them with the alphabets to their immediate right, respectively.

If both alphabets in the group are the same, add x after the first alphabet.The encryption processes will be performed on these groups. Break the alphabets into groups (each group must contain two values).If I or J is present in the keyword, discard both I and J while filling the remaining space encryption process. Note: while doing so, combine I and J in the same cell of the table. Fill the remaining spaces with the rest of the alphabets (A – Z) that were not a part of the keyword.Skip the duplicate words in the keyword.

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.

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.

#SUBSTITUTION CIPHER DECODER CRACK#

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.