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Dooga Blackrazor
Dec8-04, 06:52 PM
http://www.sosmath.com/matrix/coding/coding.html
How would you decode the encryption at the bottom of the page?
Find the inverse of A and left-multiply it by the coded matrix. Call B the message matrix, and B' the coded matrix. You get the coded matrix by finding
AB = B'
Get the uncoded matrix by taking
A^(-1)B' = A^(-1)AB = IB = B
They give the inverse matrix of A just above the sentence "I LOVE MONICA". It appears to be off though, and is actually the negative of the inverse.
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