Hill cipher online tool5/29/2023 However, if we test each row individually then there is only 26 Nkeys we need to test, For N=3 there is 26 3 = 17,576 which is a very small number in comparison (Takes 0.5 seconds on my pc!) For N=3, there is 26 9 ≈ 5.43×10 12 keys, to test all of these is not feasible (I calculated on my pc it would take ≈ 8 years to test them all). We can use this fact to dramatically decrease the number of keys we have to test to break the Hill Cipher.įor square matrix of size N, there are 26 N×Nunique keys (there will be less as not all matrices have an inverse). Notice how the top row of the far left matrix is only involved in the top cell of the ciphertext matrix, the middle row is only involved in the middle cell etc. The first thing to note is that when encoding in Hill Cipher each row of the key matrix encodes to 1 letter independently of the rest of the key matrix. If you need a reminder on how the Hill Cipher works click here.
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