      # Matrix Result Using Modular Arithmetic

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### #1 aaracena

aaracena

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Posted 31 July 2004 - 02:24 PM

Hello,

I need that the result of a matrix multiplicacion can be affected by a modular function, for example, I will show a criptography exercise that use it:

(9 , 20 ) x
11 8
3 7 = (99 + 60, 72 + 140) = (159, 212)

thist result applying modulo 26 is = (3,4)

to this result, I need to applied a inversed matrix that multiplied with the computation above will give me the original number (9, 20), all using mod 26:

inverse
11 8
3 7 =

7 18
23 11

(3, 4) x
7 18
23 11 = (9, 20)

I need to do that with the classpad 300, somebody know do that?, thank you.

Amaury A.

### #2 Overlord

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Posted 31 July 2004 - 03:21 PM

you want to find the inverse or to apply the mod function ?

### #3 aaracena

aaracena

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Posted 01 August 2004 - 04:29 PM

you want to find the inverse or to apply the mod function ?

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I need also to find the inverse, but bassically I need that the result of a matrix multiplication can be affected by a modular function, like I show in the example, thanks for you response.

Amaury A.

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