© All Rights Reserved Cryptography Cryptography is derived from the Green word ‘kryptos’ which...

Cryptography

Cryptography is derived from the Green word ‘kryptos’

which means hidden or secret

Cryptography

Cryptography is thought to date back to the Egyptians and their use of hieroglyphics.

Cryptography

Hieroglyphics were complex pictograms.

At the time, the meaning of the hieroglyphics were known by only a few.

Cryptography

What does this hieroglyphic message say?

Cryptography

You can only understand this message if you have the code or the key to ‘unlock’ or decipher it.

Cryptography

Now you have the ‘key’, see if you can decipher the message.

Cryptography

Julius Caesar developed the first modern cipher.

It is known as the ‘Caesar cipher’

Cryptography

Each character in the message is replaced by the character three positions ahead of it in the alphabet

Cryptography

Caesar Cipher

Cryptography

Decode the following message:

FURVV WKH ULYHU WRQLHKW

Cryptography

The message said:

CROSS THE RIVER TONIGHT

Cryptography

Why might Julius Caesar encrypt his messages?

Think of two disadvantages of using the Caesar Cypher

Cryptography

Why might Julius Caesar encrypt messages his messages?

- So that he could safely send messages to his troops.

Even if the messanger was caught, his enemies wouldn’t understand the message

Cryptography

Think of two disadvantages of using the Caesar Cypher

-The person receiving the message would have to understand how to decrypt it

- Caesar ciphers are easy to break

-It doesn’t allow for numbers or symbols

Cryptography

Plenary

Explain the following terms to your partner:

•Cryptography

•Decrypt

•Caesar Cypher

© All Rights Reserved Cryptography Cryptography is derived from the Green word ‘kryptos’ which...

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