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September 21st, 2018, 04:26 AM   #1
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Cool Cryptography/Matrices

Hello, there was a matrix problem I was unable to work out completely:

'Your task is to crack the following code and find the encrypted word.

To make your task easier, the following information about the encoding matrix is given:

Position 1,1 in the encoding matrix is an even number
- The decoding matrix only contains integers
- Position 1,1 in the encoding matrix is the negative of the number in position - 1,1 in the decoding matrix
- Modulo arithmetic hasn't been used

My coded message is:

91, -38, 137, -59, 145, -59

How would I go about solving it; I know that E^-1 x EA will decipher the message. But would I place it in a 2x2 or a 3x3 matrix? How would I work out the encoding matrix? Thank you in advance!
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