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Add "matrix must be invertible" to Hill readme

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2016-01-07 12:29:09 +00:00
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@@ -198,6 +198,9 @@ encrypt_hill("Hello, World!", [1 2; 5 7])
Notice that the input has been made uppercase and symbols have been stripped out.
The key matrix must be invertible mod 26. That is, its determinant must be
coprime to 26.
Encrypt the same text with the same key, this time represented as a string:
```julia