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I have to solve Hill's cipher. I have only cipher text: CGQIYN and key: CFDG. I don't know how to decrypt it, because in all videos I've watched they knew the Matrix key from the beginning. I don't want you to solve it, but I am really hopeless and I absolutely don't know how to do it. If you can provide me some procedure, I will be grateful. Thank you.

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  • $\begingroup$ hint: usually the matrix is written as [[C F][D G]]. $\endgroup$ – kelalaka Apr 17 at 20:26
  • $\begingroup$ Sorry, but still I don't know how to obtain key matrix. I tried everything but I got only gibberish text. In all videos and texts everyone knows the key matrix from the start and doesn't explain it. $\endgroup$ – hlll123 Apr 18 at 9:15
  • $\begingroup$ @hlll123 You can comment here to request clarifications; you should always be able to comment on qustions and answers when you are the asker. $\endgroup$ – Maarten Bodewes Apr 18 at 10:12

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