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Math Help - how and what is an encoding matrix?

  1. #1
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    how and what is an encoding matrix?

    my instructor lately likes to give us a question and have us figure it out unfortunately dont know how to program calculator (ti-83 plus) and i have no notes on how o answer this question:

    using the encoding matrix [2 3 5]
    [7 11 13]
    [17 19 23], i have encrypted the following me-
    ssage: [115 234 128 152 200]
    [398 708 421 444 583]
    [724 1326 737 876 1115]


    1. figure out the decryption matrix
    2. Decrypt the message
    3. what was the message i encrypted?

    my problem is this sholud i plug this in on the calculate or right it out? and even so how would i right it out on the calculator?

    directing me to other sites, so i can do research would greatly help me out. thank you
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  2. #2
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    Re: how and what is an encoding matrix?

    Have you considered the inverse of the Encoding Matrix?
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  3. #3
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    Question Re: how and what is an encoding matrix?

    Quote Originally Posted by TKHunny View Post
    Have you considered the inverse of the Encoding Matrix?
    I'm sorry i have not, in fact i am kinda stumped on how i even would start to answer this question using that said calculate. sorry i did not get back to you i was working :-)
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  4. #4
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    Re: how and what is an encoding matrix?

    Okay, can you do it?
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  5. #5
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    Re: how and what is an encoding matrix?

    An "encoding matrix" is a matrix, M, such that, if you write a message, in numerical form, as "X", then the coded form is MX= Y. Of course, then X= M^{-1}Y so the "decoding matrix" is the matrix inverse of M.
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