Hill cipher. Any way around the not invertible matrices
110604
Problem while decrypting Hill cipher
12035
XOR cipher with fixed key and known relation among plaintexts
130268
How to prove that a nilpotent matrix is not invertible?
63475
Is there any connection between a matrix being invertible and being diagonalizable?
125195
If matrix A is invertible, is it diagonalizable as well?
70723
Why are nonsquare matrices not invertible?
41664
Current mathematics theory used in cryptography/coding theory
32849
How to attack a classical cipher using known partial plaintext?
119052
Finding invertible elements in $\mathbb{Z}/m\mathbb{Z}$
80751
diagonalisability of matrix few properties
79739
Block diagonal matrix diagonalizable
119301
Is the following matrix invertible?
127664
Inverse elements in the absence of identities/associativity.
139087
polar decomposition of a square A when A is not full rank/invertible
43473
Turning a cipher into a hashing function
40222
Matrices that are not diagonal or triangular, whose eigenvalues are the diagonal elements
53863
Making a non-diagonalizable matrix diagonalizable with an small perturbations