CS - Comp Systems - Security Flashcards

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1
Q

Describe the purpose of a firewall

A

A firewall can be used to:

  • check that incoming data packets meet specific rules before being allowed in
  • set rules about which stations on a network can send or receive data packets
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2
Q

What threats do firewalls protect against?

A

Firewalls protect against unauthorised access to a computer system by those who might want to steal data, cause malicious harm or take control of the system.

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3
Q

What is encryption?

A

A security measure used to prevent unauthorised access to data during transmission between systems or networks.

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4
Q

Describe the purpose of encryption

A

Designed to scramble data so if an unauthorised person or organisation manage to steal data packets, they will be unable to understand the content.

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5
Q

Describe the process of encryption

A

In computing, encryption:

  • makes use of algorithms to create simple keys that can encrypt data
  • keeps the simple key secure by using public and private keys during transmission of data
  • only the correct combination of public and private key will allow access to the simple key
  • the simple key is then used again to decrypt the data
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6
Q

Describe the use of the public and private key when a message is received

A

When a message is received, the public key used to send the data must be recognised as the key that corresponds to the private key used to receive the data.

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