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IGCSE Computer Science > Security > Flashcards

Flashcards in Security Deck (5)
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1
Q

Why does data need to be kept safe?

A
  • Accidental damage could occur, such as file corruption and human errors
  • Malicious actions may be taken by other people to view, delete, copy and/or corrupt data without authorisation
2
Q
A
3
Q
A
4
Q

What is SSL?

A
  • Secure Socket Layer
  • Provides secure connection between internet browser and websites
  • Allows transmission of private data
  • Indicated by padlock sign on the web browser (sometimes the address bar is green)
  • Uses two keys to encrypt the data: a public key known to everyone and a private key only known to the recipient
  • URLs that require an SSL connection start with ‘https’
  • e.g. e-commerce shops use SSL to keep credit card details secret
5
Q

What is symmetric encryption?

A

A type of encryption where the same key is used to encrypt and decrypt the message. This differs from asymmetric (or public-key) encryption, which uses one key to encrypt a message and another to decrypt the message.

Increasing the length of the key increases the strength of the encryption.