Network Security

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NETWORK SECURITY

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The (data protection act) DPA 1998

Protects your data from other people and allows a person to see a copy of any data held about them

Data encryption

Converts plain text into something that can not be understood and can only be accessed with a key

The Caesar Cipher

Encrypts using a shift key.

Encryption within a network

Data is encrypted with a cipher and can only be unlocked and interpreted if the recipient of the data has a key.

Authentication

is the process of identifying a user or a client attempting to access a resource.

This can be done through the use of a username and a password

most systems require users to be logged in to perform actions - this can done through typed methods or biometrics.

Firewall

is used to control and monitor the exchange of data across a network.

The monitoring is governed on a set of security rules.

Firewalls can do many things to protect malicious data from entering a system, and from information being intercepted

Proxy Server Filtering - the firewall intercepts all messages within the network, hiding the network address.

Packet Filtering - the firewall looks at the data in each packet entering/leaving the network

Application gateway filtering - applying security methods and blocking protocol services, i.e. FTP

MAC (media access control) Address

All electronic devices have a MAC address.

MAC address filtering allows the identifier of devices to be entered. If this device attempts to join a network, it is immediately rejected.

Mobile Hotspots

devices can be found on a network using their MAC address.

The bottom number is the registered IP address and the top number is known as the MAC address - this is an alphanumeric string that is unique identifier for a device on the network