Input your text that you want to have encoded. Then input four matrix numbers. The Matrix Cipher is a cipher that uses a matrix (it can be of any size, this one uses a 4x4 matrix) to encode text. Pick random numbers according to the size of your matrix (this one uses four numbers, bigger matrices will use more than four), then use this formula: AX+BY. You convert the letters of your original text into numbers according to where they are in the alphabet (a is one, b is two, etc.) and then you multiply by your matrix numbers in order (so if the numbers were 4, 6 and 8, you'd multiply the first letter by 4, then the next one by 6, and so on) and do everything MOD 26. Then you convert the numbers back into letters, and that's your coded text! This is relatived to other ely easy to encode/decode, but if someone else wanted to try to break it, they couldn't do it very easily without knowing the matrix numbers and the size of the matrix. It IS possible, though, and as ciphers go, it's pretty easy to crack. Still, the matrix cipher is pretty computationally secure compared to other ciphers. If you still don't understand the matrix cipher: https://en.wikipedia.org/wiki/Hill_cipher
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