Security Precautions

• Firewall


  Protects systems by checking incoming and outcoming data packets
• Firewalls


  • Check that incoming packets meet specific rules before being allowed in
  • Set rules about which stations on a network can send or receive packets
• Firewall rules


  • Sender (source) IP address
  • Receiver (destination) IP address
  • Port numbers
  • Protocols
• Purpose of 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
• Encryption


  A security measure used to try to prevent unauthorised access to data during transmission from one system or network to another
• Encryption

  • Scrambles data so that if an unauthorised person or organisation manage to steal data packets, they will be unable to understand the content
  • 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