Question: Problem 5 : . ( a ) The ciphertext UUSN was encrypted by a Hill cipher with a 2 2 matrix. The plaintext is boot.

Problem 5:.
(a) The ciphertext UUSN was encrypted by a Hill cipher with a 22 matrix. The plaintext is boot. Find
the encryption matrix.
(b) Suppose the ciphertext is EUSN and the plaintext is still boot. Find the encryption matrix. Note that
the first column of the matrix is changed. What does it mean? Is it a good or a bad property of a cipher.
Discuss.
Problem 5:. (a) The ciphertext UUSN was encrypted by a Hill

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