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Computer Science

GCSE · AQA

QuestionsFlashcards

Cyber Security Threats
Social Engineering
- What Social Engineering Is
  4
- Blagging, Phishing & Shouldering
  5
Malware
- What Malware Is
  2
- Viruses, Trojans & Spyware
  3
Detecting & Preventing Threats

Authentication & Encryption Flashcards

All 7 cards in this deck

What is encryption?: Scrambling data using a key, turning plaintext into ciphertext, so that it cannot be understood by unauthorised users.
What name is given to a message before it has been encrypted?: Plaintext — an unencrypted message that is readable to anyone.
What name is given to a message after it has been encrypted?: Ciphertext — an altered message that is unreadable to unauthorised parties.
What is needed to encrypt and decrypt a message?: A key — a secret value used with the encryption algorithm to disguise and recover the message.
Why is data encrypted before it is transmitted across a network, especially a wireless one?: So that if it is intercepted by an unauthorised person it cannot be understood without the key.
True or false? Encryption stops data being intercepted while it is transmitted.: False. It does not prevent interception; it makes the intercepted data unreadable without the key.
How does authentication help to keep a network secure?: Users must prove who they are, e.g. with a username and password, before they can access the network. Only authorised people get access to its data and resources.