The cell formed by the intersection of the row and column


Consider a secret-key cipher that has a 26 ´ 26 matrix with the columns headed by ABC ... Z and the rows also named ABC ... Z. Plaintext is encrypted two characters at a time. The first character is the column; the second is the row. The cell formed by the intersection of the row and column contains two ciphertext characters. What constraint must the matrix adhere to and how many keys are there?

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Computer Engineering: The cell formed by the intersection of the row and column
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