Math Is Fun Forum

finitehelp

Member

Registered: 2009-06-21

Posts: 80

Decode the matrix

Using the decoding matrix
A= [1 2
3 4]
solve for the code:
{63, 54, 76, 64, 135, 120, 174, 142}

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Decode the matrix

Hi finitehelp;

From what I remember about matrix encoding and decoding you have to start with a matrix A that you use for encoding. Then you invert A to decode the message. Also if {63,54,76,64,135,120,174,142} is the encoded message.

and

is your inverted matrix.

Then the message is set up like this:

you multiply the decoding matrix and the message matrix

You get:

Put it back into the list. This is the decoded message.

{171.405,204,484,375,885,458,1090}

This answer seems strange to me. Are you sure that A is the decoding matrix?

Last edited by bobbym (2009-06-23 06:56:49)

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