9/20/2023 0 Comments Substitution cipherFor that number the alphabets such as A=0, B=1, C=2, …………, Z=25. Now, we have to convert the key matrix and plain text matrices into numeric matrices. The general equation to find cipher text using hill cipher is as follow:įor our example, our key matrix would be:Īnd our plain text matrices of 2×1 will be as follow: In our case, the key matrix is 2×2 then the column vectors of plain text would be 2×1. Now, of plain text, you have to form a column vector of length similar to the key matrix. With HILL as the key, we can form a 2×2 matrix. Let us discuss the technique of hill cipher.Ĭhoose the key in such a way that it always forms a square matrix. Hill cipher is a polyalphabetic cipher introduced by Lester Hill in 1929. When compared with monoalphabetic cipher Playfair cipher is much more advanced. So, this is how we can convert a plain text to ciphertext using Playfair cipher.
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