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.

pst.

I need calcutate the inverse and apply modular function to the result.

# Modular Function To A Matrix

Started by
aaracena
, Aug 04 2004 03:09 PM

3 replies to this topic

### #1

Posted 04 August 2004 - 03:09 PM

### #3

Posted 04 September 2004 - 09:11 PM

I don't know much about modular math but i took a look at your exercice and what i think you need to do is get the final matrix divide it by 26 (what you need) keep only the fractional part and the multiply it by 26.

In your calculator make all the steps you need and then just do the following to the resuting matrix

assume you have the result [99+60,72+140] => [159,212] in Mat A, then do

Frac ( Mat A*(1/26))*26 and you get [3,4]

i hope this helps

In your calculator make all the steps you need and then just do the following to the resuting matrix

assume you have the result [99+60,72+140] => [159,212] in Mat A, then do

Frac ( Mat A*(1/26))*26 and you get [3,4]

i hope this helps

### #4

Posted 05 September 2004 - 08:52 AM

Me parece que lo que buscas est?s en mi p?gina personal. Mira aqu? (si no sabes espa?ol puedes pedirle ayuda a Betoe):

http://www.omerique....riptografia.htm

Espero que te sea de ayuda.

Saludos.

http://www.omerique....riptografia.htm

Espero que te sea de ayuda.

Saludos.

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