3.4.2

Caesar Cipher

Test yourself on Caesar Cipher

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Caesar Cipher

The Caesar Cipher is a simple encryption method.

To encrypt

To encrypt

To encrypt text, we must shift each letter by the number of places defined by a shared secret key.
For example:
- If we have a key of +2 then each letter will be replaced with the letter 3 places ahead of it, i.e. a becomes c, b becomes d, and so on.
- Therefore, "hello" would become "jgnnq".

To decrypt

To decrypt

To decrypt, simply encrypt with the negative of the key.
Therefore, "jgnnq" would become "hello".

Security

Security

The Caesar Cipher is a very weak form of encryption, and would never be used alone in a real-life scenario.

1

Problem Solving

1.1

Algorithms

1.1.1Algorithm Thinking 1.1.2Interpreting Algorithms 1.1.3Expressing Algorithms - Pseudocode 1.1.4Expressing Algorithms - Flow Charts 1.1.5Correcting Algorithms 1.1.6Completing Algorithms 1.1.7Search Algorithms 1.1.8Linear Search 1.1.9Binary Search 1.1.10Sort Algorithms 1.1.11Bubble Sort 1.1.12Merge Sort

1.2

Decomposition & Abstraction

1.2.1Computational Thinking - Abstraction 1.2.2Computational Thinking - Decomposition 1.2.3End of Topic Test - Algorithms

2

Programming

3

Data

3.1

Binary

3.1.1Number Bases 3.1.2Negative Binary Numbers 3.1.3Binary Addition 3.1.4Binary Shifts

3.2

Data Representation

3.2.1Representing Text 3.2.2ASCII 3.2.3Unicode 3.2.4Representing Images 3.2.5Representing Sound

3.3

Data Storage & Compression

3.3.1Capacity 3.3.2Calculating Capacity Requirements 3.3.3Data Compression 3.3.4Run Length Encoding

3.4

Encryption

3.4.1Encryption 3.4.2Caesar Cipher 3.4.3Ciphers

3.5

Databases

3.5.1Databases 3.5.2End of Topic Test - Data & Representation

4

Computers

4.1

Machines & Computational Modelling

4.1.1Computational Models 4.1.2Input-Process-Output Model

4.2

Hardware

4.3

Logic

4.3.1Binary Systems 4.3.2Logic Circuits 4.3.3Boolean Logic 4.3.4End of Topic Test - Logic

4.4

Software

4.4.1Operating Systems 4.4.2User Interface Managetment 4.4.3Memory and Process Management 4.4.4File Management 4.4.5Device Management 4.4.6User Management 4.4.7Encryption Software 4.4.8Defragmentation Software 4.4.9Data Compression Software 4.4.10Backup Software

4.5

Programming Languages

4.5.1High Level Languages 4.5.2Low Level Languages 4.5.3Translators - Compilers 4.5.4Translators - Interpreters 4.5.5Translators - Assemblers 4.5.6End of Topic Test - Translation & Representation

5

Communication & The Internet

5.1

Networks

5.2

Network Security

5.2.1User Access Levels 5.2.2Encryption 5.2.3Protecting Against Malware 5.2.4Firewalls 5.2.5Forms of Attack 5.2.6Penetration Testing 5.2.7Malware 5.2.8How Malware Spreads 5.2.9Social Engineering 5.2.10Protecting Against Social Engineering 5.2.11Phishing 5.2.12Network Administration 5.2.13Network Forensics

5.3

The Internet & the World Wide Web

5.3.1IP Addresses 5.3.2Types of IP Address 5.3.3MAC Addresses 5.3.4Packet Switching 5.3.5How Do Packets Get Routed?5.3.6Did My Data Arrive Safely?5.3.7The Internet 5.3.8URLs 5.3.9DNS 5.3.10Web Hosting 5.3.11End of Topic Test - Security

6

The Bigger Picture

Jump to other topics

1

Problem Solving

1.1

Algorithms

1.1.1Algorithm Thinking 1.1.2Interpreting Algorithms 1.1.3Expressing Algorithms - Pseudocode 1.1.4Expressing Algorithms - Flow Charts 1.1.5Correcting Algorithms 1.1.6Completing Algorithms 1.1.7Search Algorithms 1.1.8Linear Search 1.1.9Binary Search 1.1.10Sort Algorithms 1.1.11Bubble Sort 1.1.12Merge Sort

1.2

Decomposition & Abstraction

1.2.1Computational Thinking - Abstraction 1.2.2Computational Thinking - Decomposition 1.2.3End of Topic Test - Algorithms

2

Programming

3

Data

3.1

Binary

3.1.1Number Bases 3.1.2Negative Binary Numbers 3.1.3Binary Addition 3.1.4Binary Shifts

3.2

Data Representation

3.2.1Representing Text 3.2.2ASCII 3.2.3Unicode 3.2.4Representing Images 3.2.5Representing Sound

3.3

Data Storage & Compression

3.3.1Capacity 3.3.2Calculating Capacity Requirements 3.3.3Data Compression 3.3.4Run Length Encoding

3.4

Encryption

3.4.1Encryption 3.4.2Caesar Cipher 3.4.3Ciphers

3.5

Databases

3.5.1Databases 3.5.2End of Topic Test - Data & Representation

4

Computers

4.1

Machines & Computational Modelling

4.1.1Computational Models 4.1.2Input-Process-Output Model

4.2

Hardware

4.3

Logic

4.3.1Binary Systems 4.3.2Logic Circuits 4.3.3Boolean Logic 4.3.4End of Topic Test - Logic

4.4

Software

4.4.1Operating Systems 4.4.2User Interface Managetment 4.4.3Memory and Process Management 4.4.4File Management 4.4.5Device Management 4.4.6User Management 4.4.7Encryption Software 4.4.8Defragmentation Software 4.4.9Data Compression Software 4.4.10Backup Software

4.5

Programming Languages

4.5.1High Level Languages 4.5.2Low Level Languages 4.5.3Translators - Compilers 4.5.4Translators - Interpreters 4.5.5Translators - Assemblers 4.5.6End of Topic Test - Translation & Representation

5

Communication & The Internet

5.1

Networks

5.2

Network Security

5.2.1User Access Levels 5.2.2Encryption 5.2.3Protecting Against Malware 5.2.4Firewalls 5.2.5Forms of Attack 5.2.6Penetration Testing 5.2.7Malware 5.2.8How Malware Spreads 5.2.9Social Engineering 5.2.10Protecting Against Social Engineering 5.2.11Phishing 5.2.12Network Administration 5.2.13Network Forensics

5.3

The Internet & the World Wide Web

5.3.1IP Addresses 5.3.2Types of IP Address 5.3.3MAC Addresses 5.3.4Packet Switching 5.3.5How Do Packets Get Routed?5.3.6Did My Data Arrive Safely?5.3.7The Internet 5.3.8URLs 5.3.9DNS 5.3.10Web Hosting 5.3.11End of Topic Test - Security

6

The Bigger Picture

Practice questions on Caesar Cipher

Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.

1
What is the encrypted version of "Cat" with a key of +3?Multiple choice
2
If the encrypted text is "Czf" and the key is +1, then what is the original text?Multiple choice
3
Which of these statements about Caesar cypher are true?True / false
4
A Caesar cypher with a key of +13 has the same encryption and decryption method. <br/>True or false?Multiple choice

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Encryption

Ciphers