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Lesson 1 - Encryption Decryption and ciphers

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Learning Objectives
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 1 I can define what encryption and decryption means
 2 I can describe what a cipher is
 4 I can decrypt messages using ciphers
 5 I can encrypt messages for others to decrypt

🏁 Learning Objective 1 :- I can define what encryption and decryption means


Encryption

Encryption is the process of converting information or data into a code, especially to prevent unauthorized access.

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Task 1 - Research and define the word ENCRYPTION

Decryption

Decryption is the process of taking encoded or encrypted text or other data and converting it back into text that you or the computer can read and understand.

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Task 2 - Research and define the word DECRYPTION


Decryption

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🏁 Learning Objective 2 :- I can describe what a cipher is


What is a Cipher?

A cipher is any method of 'Encrypting' text. It is also sometimes used to refer to the encrypted text message itself, although here the term ciphertext is preferred.

Who would use a Cipher?

Task - Research 3 famous Ciphers from history and find out what they were used for?

Atbash

Task - Find out what a pigpen cipher is, who used it and then see if you can write your name in it?

Pigpen

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🏁 Learning Objective 3 :- I can decrypt messages using ciphers


Decrypting a message using a Cipher?

Here is an encrypted message (ciphertext): MAX BGLBWX PAXXE XGVKRIML, MAX HNMLBWX PAXXE WXVKRIML.

See if you can decrypt it using the wheel below

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🏁 Learning Objective 4 :- I can encrypt messages for others to decrypt


Encrypting a message using a Cipher?

Create an encrypted message (ciphertext): using the wheel below

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Teacher Date: 2026-02-15


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