1. Hill Cipher
The Hill Cipher uses matrix multiplication to encrypt a message. First, you need to assign two numbers to each letter in the alphabet and also assign numbers to space, . , and ? or !. The key space is the set of all invertible matrices over Z was chosen because there are 26 characters

2. Hill Cipher

3. Hill Cipher

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8. Inverse of matrix (2,2)
K = To find inverse of K, find the determinate of K d = Det(K) = d = 5* 3 – 2 * 3 = 9

9. Hill Cipher
The inverse table d = 9

10. Hill Cipher

11. Hill Cipher

12. Hill Cipher