Using Inverse Matrices in Real Life

i think this is very interesting!!
we can use matrices to create a cryptogram
cryptogram is a message written according to a secret code.
From greek word kryptos meaning hidden and gramma meaning letter.
steps 2 create a cryptogram:
. Assign a number to each letter in the alphabet with out a blank space.
. Convert the message to numbers partitioned into 1*2 uncoded row matrices.
. To encode a message choose a 2*2 matrix A that has an inverse and multiply the uncoded row matrices by A on the right to obtain coded row matrices.
for example:
convert : GET HELP
. 7 5 20 0 8 5 12 16
. [7 5] [20 0] [8 5] [12 16]
. encode use A= 2 3
-1 -2
to see the answer just download the following:
http://www.google.com/url?sa=t&source=web&ct=res&cd=11&ved=0CAcQFjAAOAo&url=http%3A%2F%2Fguilford.rps205.com%2Fdepartments%2Fmath%2FLinks%2FAlgebra%2520II%2520-%2520College%2520Alg%2F4.4%2520Cryptograms%2520Using%2520Inverse%2520Matrices%2520in%2520Real%2520Life.ppt&ei=4bJDS7q6Nc7X4gap5sTGDA&usg=AFQjCNER0oUlU2FsTOVJ0Nuam0xTfjPIeg&sig2=UYWzPn9H0M5WADqSk0NopA

we can encode and decode!!!



Claudia Abdel-Sater