Encryption
Overview
Every time you log in to a bank or send a message, your data travels across networks where it could be intercepted. Encryption is the lock that keeps that data meaningless to anyone who steals it on the way. It does not stop a thief grabbing the data, it makes the stolen data useless.
In this lesson you will learn why encryption is needed, the difference between scrambled cipher text and readable plain text, and the two methods you must be able to describe: symmetric encryption, which shares one secret key, and asymmetric encryption, which uses a clever public and private key pair to keep the secret safe even on the open internet.
Objectives
- 1 Understand the need for and purpose of encryption when transmitting data
- 2 Understand how data is encrypted using symmetric and asymmetric encryption
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Encryption. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- What is the name given to data after it has been encrypted? A. plain text B. cipher text C. metadata D. payload Answer: B
- Symmetric encryption uses: A. no key B. a public and a private key C. the same key to encrypt and decrypt D. two public keys Answer: C
- Which statement about encryption is correct? A. it stops a hacker stealing data B. it makes stolen data meaningless C. it deletes intercepted data D. it speeds up transmission Answer: B
- In asymmetric encryption, which key decrypts data sent to you? A. your public key B. your private key C. the sender's private key D. a shared key Answer: B
- Why is asymmetric encryption considered more secure for internet use? A. it uses shorter keys B. the decryption key is never transmitted C. it does not need a key D. it is faster Answer: B
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Recommended Books
Practice Mock Questions
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