The Hill cipher is a historic polygraphic substitution cipher invented by Lester S. Hill in 1929.

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Hill cipher key space

Key space is the set of all possible keys that can be used to generate a key.we using the number of valid key to describe it. Q: I've given a hill cipher of block size k over alphabet of size p, ...
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How to decode a Hill Cipher without a key?

On my exam, we had to solve this problem: message matrix is: [20, 19, 14; 17, 0 10] and the ciphertext matrix is: [18, 15, 16; 3, 24, 24]. Find key matrix. I couldn't solve this problem, because I ...