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security risks (fire walls (data is usually split into 'packets'…

- - - - firewalls are used to check data packets as they are sent to or received from a system or network. 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.
        
        firewalls can be used to:
        
        check that incoming packets meet specific rules before being allowed in
        
        set rules about which stations on a network can send or receive packets
        
        rules are cretead that take account of the following:
        
        sender (source) IP adress
        
        receiver (destination) IP adress
        
        port numbers
        
        protocols
- - - - 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