# Can you decipher the word MNA?

## Cryptography made easy - write in cryptography

### The chicken coop code

What you need:
Two sheets of paper, a pen

That's how it's done:
First the key must be noted. First draw a grid consisting of two vertical and two horizontal lines - a field with nine boxes is created. Next to it, paint two diagonals that form a cross (see picture).

Next to it, paint two diagonals that form a cross. Repeat the process: Draw another field with nine boxes and another cross. Put one point in each field. Enter a letter in each of the 26 boxes, from A to Z.

VoilĂ , the key is ready. Now take a second piece of paper to write the secret message on. Instead of the letters, use the lines and dots that surround the letter in the key. If this is still too easy for you, change the order of the letters in the key. Only those who know the order can decipher the message.

### From Z to A with Atbash

What you need:
Two sheets of paper, a pen

That's how it's done:
Atbash is a simple encryption technique of Jewish origin. The alphabet is used backwards instead of forward. An A becomes Z, B becomes Y and so on. The best thing to do is to write the key for this code on a piece of paper and the secret message on another piece of paper: THAT'S THE ATBASH FONT - WZH RHG WRV ZGYZHS-HXSIRUG.

### Encrypt like Caesar

What you need:
A printer, A4 size paper, scissors and a bag clip (T-shaped metal clip for book shipments)

That's how it's done:
The Roman general Caesar is said to have encrypted his secret messages in this way: Always use the letter that occurs three places after the actual letter in the alphabet. A became D, B became E and Z became C. The Caesar cipher can also be modified by moving about five instead of three digits in the alphabet.

You can print out an aid - a so-called encryption disk - here. Print out the picture, preferably on thick paper. Cut out both circles. Place the smaller disc on top of the larger disc and insert the bracket through the common center point.

The outer circle is for the original text, the inner circle for the encrypted text. Of course, the person who receives the secret message also needs such a disk. In order to decipher the message, he should also know how many places the broadcaster has shifted his target.

### The square cipher

What you need:
Two sheets of paper, a pen

That's how it's done:
Think about how many letters you will need to encode your text. If there are 16 or less, draw a 4 x 4 square. If you need more letters, take a 5 x 5 square. Now enter your message letter by letter in the square - not from left to right, but from top to bottom.

Fill in the remaining fields with additional letters, even if you do not need them. Now write down the encrypted message on the second piece of paper: To do this, transfer the letters from left to right. In order to crack the code, the recipient only needs to know how the square is structured - in this case the secret number is 4.