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Security Precautions (Firewalls (Firewalls can also be used for checking…
Security Precautions
Firewalls
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This means that something like an image file is not sent as one single file. The image data is split into lots of different packets that can be reassembled to create the image file once they are received.
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Firewalls can also be used for checking that incoming packets meet specific rules before being allowed in.
Set rules about which stations on a network can send or receive packet.
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Encryption
Encryption is a security measure used to try to prevent unauthorised access to data during transmission from one system or network to another.
Encryption is designed to scramble data so that if an unauthorised person or organisation manage to steal data packets, they will be unable to understand the content.
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The development of encryption dates from before computers. It has roots in cryptography - the process of scrambling a message using a secret simple key.
If someone wanted to send the message, 'Hello' but did not want anyone who might intercept the message to be able to understand it, they could create a 'simple key'. The simple key is only known by the sender and receiver.