Question: Use a Hill Cipher, with the usual encoding of the letters from a to z, working mod 26. Alice is using a Hill Cipher with

Use a Hill Cipher, with the usual encoding of the letters from a to z, working mod 26.

Alice is using a Hill Cipher with a different key K. Eve convinces her to send the message advertise now and sees the ciphertext is gjjctnysu vkq. Find K for Eve.

For a key-recovery attack on a Hill Cipher, why would convincing the victim to send the text ABBA Rock be particularly helpful?

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