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Can anyone help me out by solving this ciphertext using m =2

TUNAISYPLUKUDDDPOOCZZLLCUDVDCYXJEKYIKORRPVAIYPGUUC

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closed as off-topic by yyyyyyy, kelalaka, Ella Rose Mar 17 at 15:24

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    $\begingroup$ Welcome to Cryptography. If unbreakable then how do you expect one to solve? Is this homework or CTF. Either way, 2 is small, you have $26^4$. You can first check that the determinant is non-zero so that the matrix is invertible, then check that the result contains some valid strings from the target language. $\endgroup$ – kelalaka Mar 17 at 13:10
  • $\begingroup$ It's a 2*2 matrix and m=2 there is no change in that. It is unbreakable ciphertext for me not in general. Anyways thanks for the suggestion. $\endgroup$ – Adi Mar 18 at 7:06