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anonymous

  • one year ago

The Matrix c=1 -2 (top)-3 7(bottom) was used to encode a phrase to [7 -28 -25-35-2 -21 107 90 123 17] . find C^_ and use it to decode the matrix. I need someone to show me how i would decode a matrix. i will become a fan and give a medal to whoever helps me

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    *the screenshots are easier to understand * I will BECOMe a Fan*

  3. perl
    • one year ago
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    you can encode it using column vectors

  4. anonymous
    • one year ago
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    i dont know what that is

  5. perl
    • one year ago
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    which one do you want help with, number 13?

  6. anonymous
    • one year ago
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    yes

  7. perl
    • one year ago
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    ok we want to encode the phrase, one question to go. i believe we want to include spaces. so we can use a matrix

  8. anonymous
    • one year ago
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    isn't 1 -2 the matrix ? -3 7

  9. perl
    • one year ago
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    The idea here is to code it this way $$ \begin{bmatrix} 1 & -2 \\ -3& 7 \end{bmatrix} \cdot \begin{bmatrix} O & E& Q& E & T & O\\ N &\_ & U & S & I & N \end{bmatrix} $$

  10. anonymous
    • one year ago
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    so what i do next multiply it ?

  11. perl
    • one year ago
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    The idea here is to code it this way $$ \begin{bmatrix} 1 & -2 \\ -3& 7 \end{bmatrix} \cdot \begin{bmatrix} O & E& Q& E & T & O& \_ &O &G\\ N &\_ & U & S & I & N &T &\_ &O \end{bmatrix} $$

  12. perl
    • one year ago
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    do you agree with that so far, we just need to change the letters to numbers now

  13. anonymous
    • one year ago
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    oh thats all we have to do ?

  14. perl
    • one year ago
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    change to numbers and multiply, yes

  15. anonymous
    • one year ago
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    okay i think i got it now

  16. anonymous
    • one year ago
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    but where did you get all those letters from ?

  17. perl
    • one year ago
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    read it down vertically

  18. anonymous
    • one year ago
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    ok

  19. anonymous
    • one year ago
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    do i replace the _ with a zero ?

  20. perl
    • one year ago
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    http://prntscr.com/7c1g1p

  21. perl
    • one year ago
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    right

  22. anonymous
    • one year ago
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    okay i seee lol ....

  23. perl
    • one year ago
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    here is an example http://aix1.uottawa.ca/~jkhoury/cryptography.htm

  24. anonymous
    • one year ago
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    oh that's what you meant by using column vectors

  25. perl
    • one year ago
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    right, the only difference they used number 27 for _ and we used 0

  26. anonymous
    • one year ago
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    yeah , so when you decode it ,it'll turn into letters or a phrase

  27. perl
    • one year ago
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    right

  28. anonymous
    • one year ago
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    okay i understand how to do it , it's going to take me a minute to get my answer soo thanks for helping me understand it .

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