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Wireless Security
Technical Point-of-View

Wireless Security
Technical Point-of-View

W ireless network (Wi-Fi) is now widely established and utilized at home, offices and everywhere in public areas such as rail stations, streets, and etc. This newsletter provides the technical knowledge of Wi-Fi technologies, relevant threats and countermeasures for building a secure internal Wi-Fi network.

For the end user best practices of using Wi-Fi, please refer to another newsletter entitled “Wireless Network, Best Practices for General User”. Wireless Technologies |

Classification of Networks

Technological advancement in wireless communications has led to the worldwide proliferation of networks. The various kinds of network technologies developed can be classified into the following categories according to their range of coverage:

Wireless Wide Area Network (WWAN)

WWAN offers the largest coverage. Voice and data can be transferred between mobile phones via messaging apps, web pages and video conferencing. In order to secure the transfer, encryption and authentication methods are adopted. Examples of WWAN are 4G, 3G and 2G networks.

Wireless Metropolitan Area Network (WMAN)

MAN (Metropolitan Area Network) covers across the entire city and WMAN provides the Wi-Fi network similar to MAN. WiMAX and Wireless MAN are both examples of this kind.

Wireless Local Area Network (WLAN)

WLAN is an 802.11i wireless network that facilitates the access of corporate environment. It is optimal for low range access with high bandwidth requirements. Internal Wi-Fi within the office area can be regarded as WLAN.

Wireless Personal Area Network (WPAN)

WPAN has the least coverage among all. It is usually adopted for devices which perform Bluetooth or Near Field Communication (NFC) functions. In Hong Kong, NFC-enabled devices like Octopus Card, is commonly

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