# Cryptography and Coordinates

Your school prohibits using cellphones during school hours, but you and your friends found a way to communicate using encrypted messages, so that just those who have the key can understand the content of the message.
Here is your key!
It's a grid, containing all the letters of the alphabet. Each letter has its own coordinates, and only who has the same exact grid can decode the message.

## The Signature

Every message must be signed, in order to understand who is the sender. My signature is . What is yours?

## Separating Words

An encrypted message must be understandable though! We will separate words by enclosing each one of them in braces. Write an encrypted message to a classmate.

## Securing Data

Securing data is the core principle on which cryptography methods are based.
If we used as key just the* x*-coordinates of the points that you see in the grid, would this method be as safe as the original one?
And what if we used only *y*-coordinates?
If you had to choose between *x*-coordinates or y-coordinates only to encrypt your message, which of the two methods would be the most efficient and safe?
Explain your choice in detail.

## Create Your Own Decryption Grid

Drag the points in the app below to create your own decryption grid.
Points must respect the following conditions:
- each point must have unique coordinates
- the

*x*-coordinate of the*vowels*is -1 - the*x*-coordinate of*D*is -6 - the*x*-coordinate of*H*and*K*is -5 - points*W*,*X*,*Y*and*Z*belong to the*y-axis*- points*L*,*M*,*N*,*R*,*S*and*T*belong to the*x-axis*- the*y*-coordinate of*B*,*F*,*J*,*P*and*V*is 3 - points*C*,*G*, and*Q*have their*x*-coordinate equal to their*y*-coordinate