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does hill cipher use which matrix

in flag

I found in many recourses that hill cipher uses 2X2 and 2X1, other uses 1X2 and 2X2 so which one is correct, if I one matrix and turned it into another it does work? so which one to use

kelalaka avatar
in flag
In this [answer](https://crypto.stackexchange.com/a/85950/18298) here you can find the link to the original paper. Any square and invertible matrices...
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