- 
[todo1](https://github.com/rashadalsharpini/sage/blob/28a7d0422ba718b81d555a29ec02ef07cf6d92e9/src/sage/crypto/classical.py#L1547)
 


- 
[todo2](https://github.com/rashadalsharpini/sage/blob/28a7d0422ba718b81d555a29ec02ef07cf6d92e9/src/sage/crypto/classical.py#L1573)
 


For the Hill cipher, encryption is defined as
- encryption c = A * M
and decryption as
- Decryption M = A^-1 * c

in these todos i have to check if A is an invertible matrix
is this correct ?

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