1.2.6

Encryption

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Encryption

If sensitive data is going to be transferred, then it is important that we keep it secure from third parties.

Encryption

Encryption

  • Encrypting data is the process of scrambling data according to a specific algorithm so that it cannot be read by third parties.
  • Only the intended recipient will know how to decode the data.
Keys

Keys

  • A lot of encryption depends upon secret keys, which are shared secret pieces of data.
  • Keys are made up of a pair of very large prime numbers, either 256 or 1,024 bits long.
  • It would take an impractical amount of time to guess the key. So we say that the encryption is secure.
Wireless communication

Wireless communication

  • It is especially important to encrypt wireless communication.
  • Protocols exist for wireless communication, such as WiFi Protected Access version 2 (WPA2), which encrypt all traffic.

Symmetric Encryption

The use of encryption is vital to protect our private information. One type of encryption is symmetric encryption.

Symmetric encryption

Symmetric encryption

  • Symmetric or private key encryption is used to encrypt data for transmission.
  • A private key is used to convert plain text into cypher text.
  • This cypher text and private key are then transferred to another location or person.
  • The key is then used to decrypt the cypher back into plain text.
Security

Security

  • Using a single key to encrypt and decrypt text proposes a massive flaw in security, as anyone with the key can decrypt the cypher.
  • As with passwords, the longer the encryption key, the less likely it is to be compromised by brute force, and so the more secure the encryption.
Jump to other topics
1

Computer Systems

1.1

Data Representation

1.1.1Binary Numbers1.1.2Negative Binary Numbers1.1.3Hexadecimal1.1.4Using Hexadecimal1.1.5Converting Binary & Hexadecimal1.1.6Converting Denary & Hexadecimal1.1.7Capacity1.1.8Calculating Capacity Requirements1.1.9Binary in Computer Systems1.1.10Data Compression1.1.11Run Length Encoding1.1.12File Formats
1.2

Data Transmission

1.2.1Packet Switching1.2.2Data Transmission1.2.3Universal Serial Bus (USB)1.2.4Parity Check1.2.5Checksum & Echo Checks1.2.6Encryption
1.3

Hardware

1.3.1Elements of Computer Systems1.3.2Types of Computer System1.3.3Von Neumann Architecture1.3.4The Fetch, Decode, Execute Cycle1.3.5Factors Affecting CPU Performance1.3.6Computational Logic1.3.7Input Devices1.3.82D & 3D Scanners1.3.9Code Readers1.3.10Solid State Storage1.3.11Magnetic Storage1.3.12Examples of Magnetic Storage1.3.13Optical Storage1.3.14Examples of Optical Storage1.3.15Types of Optical disk1.3.16Storage Requirements1.3.17Translation - Compilers1.3.18Translation - Interpreters1.3.19Translation - Assemblers1.3.20Acoustic Sensors1.3.21Flow Sensors1.3.22Gas Sensors1.3.23Humidity Sensors1.3.24Infrared Sensors1.3.25Level Sensors1.3.26Light Sensors1.3.27Magnetic Field Sensors1.3.28Moisture Sensors1.3.29pH Sensors1.3.30Pressure Sensors1.3.31Proximity Sensors1.3.32Temperature Sensors1.3.33Network Hardware
1.4

Software

1.4.1Operating Systems1.4.2Interrupts1.4.3High-Level Languages1.4.4Low-Level Languages
1.5

The Internet & its Uses

1.5.1The Internet1.5.2Uniform Resource Locators (URLs)1.5.3DNS1.5.4HTML1.5.5Cookies1.5.6Web Hosting1.5.7Digital Currency
1.6

Cyber Security

1.6.1Forms of Attack1.6.2Penetration Testing1.6.3Types of Malware1.6.4How Malware Spreads1.6.5Protecting Against Malware1.6.6Information Security1.6.7Structured Query Language (SQL) Injection1.6.8Firewalls1.6.9Authentication: User Access Levels1.6.10Authentication: Passwords1.6.11Social Engineering1.6.12Phishing1.6.13Denial of Service Attacks
1.7

Automated & Emerging Technologies

1.7.1Automated Systems1.7.2Robotics1.7.3Artificial Intelligence
2

Algorithms, Programming & Logic

2.1

Algorithm Design & Problem Solving

2.1.1Computational Thinking - Abstraction2.1.2Computational Thinking - Decomposition2.1.3Computational Thinking - Algorithmic Thinking2.1.4Pseudocode2.1.5Flow Diagrams2.1.6Interpreting, Correcting & Completing Algorithm2.1.7Correcting Algorithms2.1.8Completing Algorithms2.1.9Testing2.1.10Types of Testing2.1.11Test Plans2.1.12Validation & Sanitation2.1.13Authentication & Contingencies
2.2

Programming

2.2.1Programming Fundamentals - Variables & Constants2.2.2Programming Fundamentals - Comments2.2.3Programming Fundamentals - Input & Output2.2.4Data Types2.2.5Casting2.2.6Controlling Program Flow - Sequence2.2.7Controlling Program Flow - Selection2.2.8Controlling Program Flow - Iteration2.2.9Modularity - Subroutines2.2.10Modularity - Scope2.2.11Arrays
2.3

Databases

2.3.1Structuring Data - Records2.3.2Structuring Data - Databases2.3.3SQL
2.4

Boolean Logic

2.4.1Binary Systems2.4.2Logic Circuits2.4.3Truth Tables2.4.4Evaluating Expressions2.4.5Boolean Operators2.4.6End of Topic Test - Logic

Practice questions on Encryption

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

  1. 1
    A lot of encryption depends upon secret keys - what is a secret key?Multiple choice
  2. 2
    Which of the following is a well-known wireless communication encryption protocol?Multiple choice
  3. 3
    Symmetric EncryptionPut in order
  4. 4
    Is the following statement true or false? <p>Anyone with the private key can decrypt the cypher text generated by symmetric encryption.Multiple choice
  5. 5
    What is one of the simplest authentication methods?Multiple choice
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Checksum & Echo Checks

Elements of Computer Systems