Computer Science - 0478 CIE

Encryption

Gbogbo ọrọ náà

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.

Ebumnobi

1 Understand the need for and purpose of encryption when transmitting data
2 Understand how data is encrypted using symmetric and asymmetric encryption

Nkuzi Olu

Gee ntị na nkuzi a na ngwa

Maapụ uche

E seela isiokwu a ka ị hụ otu echiche si ejikọta.

Mepee maapụ uche na ngwa

Kaadị ncheta

Omume ncheta ngwa ngwa n'ihe a na-anwale n'isiokwu a.

Mee omume kaadị ndị a na ngwa

Akwụkwọ Ọmụmụ

Data sent across a network can be intercepted by a hacker. Banking details, passwords and personal messages would all be exposed if they travelled as ordinary readable text. Encryption protects this data so that even if it is intercepted it cannot be understood. Exam questions reliably ask you to explain the need for encryption and to describe how the symmetric and asymmetric methods work.

Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge

Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.

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Nnyocha Ọmụmụ

Ekele diri gi maka imecha ihe karịrị na Encryption. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

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

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