An introduction

to cryptography

Cryptography

Cryptography comes from the Greek word ‘Kyrptos’.

Kyrptos means hidden message

Cryptography is thought to go back as far a Egyptians and their use of hieroglyphics.

Cryptography

Hieroglyphics were complex pictures that were used in the same way we use the alphabet, to tell things. At the time, only a few people could understand hieroglyphics.

Cryptography

Do you know what this message means?

Cryptography

You will only be able to understand this message if you had the code to unlock or decipher it.

Cryptography

Now using the key, see if you can decipher the message.

What does it say?

Cryptography

Julius Caesar developed the first modern cipher. It is known as the ‘Caesar cipher’.

Cryptography

On the ‘Caesar cipher’ each character in a message is replaced with the character three positions ahead of it in the alphabet.

Cryptography

Can you work these out?

Cryptography

A

B

C

G

M

Z

D

E

_

_

_

_

Check you answers:

Cryptography

Cryptography

Can you decode the following message?

ZXBPXO ZFSEBO - ZOVMWLDOXMEV

Cryptography

The Message said:

Caesar Cipher- Cryptography