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What is key of hill cipher if we have plain text and cipher text?
Wiki User
∙ 10y ago
Assume Plaintext = P, Ciphertext = C, and the Key = K.
C = P * K
Therefore, multiply both sides by the inverse of P and you will get:
C * P^(-1) = K
Or, (ciphertext) * (inverse plaintext) = key
If the size of the key is known as well, then use that same size when creating P and C matrices.
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∙ 10y ago
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