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Computer Science

GCSE · OCR

QuestionsFlashcards

Identifying & Preventing Threats to Computer Systems & Networks
- Forms of Attack on a Network
  8
- Methods of Preventing a Network Attack
  10

Operating Systems & Utility Software
- The Purpose & Functionality of Operating Systems
  7
- The Purpose & Functionality of Utility Software
  6

Ethical, Legal, Cultural & Environmental Impact
- Impacts of Digital Technology on Wider Society
  7
- Legislation in Computer Science
  8

Boolean Logic Diagrams
- Boolean Logic Diagrams
  9
- Combining Boolean Operators
  7

Encryption Flashcards

All 6 cards in this deck

What is encryption?: The process of disguising a message using a secret code so that it cannot be understood by unauthorised parties.
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.