WAN: Wide Area Network.
War dialing: A brute-force attack that uses a program to automatically dial a large block of phone numbers (such as an area code), searching for vulnerable modem or fax machines.
War Driving: a brute-force attack that involves driving around, looking for vulnerable wireless networks.
Warm site: An alternative computer facility that’s already available and equipped with electrical poser, HVAC, and computers, but not fully configured.
white-box testing: A security test in which the tester has complete knowledge of the system being tested.
WIFI (wireless fidelity): Wireless network technology that utilize 802.11 protocols.
Wired Equivalent Privacy (WEP): A means of encrypting communications; specially, 802.11/WiFi networks.
Wireless Transport Layer Security (WTLS): A protocol that provides security services for the wireless application protocol (WAP) commonly used for Internet connectivity by mobile devices.
WLAN: Wireless Local Area network
Work factor: The difficulty (in term of time, effort, and ressources) of breaking a cryptosystem.
X.25: The first wide-area, packet-switching network. Today the X.25 network has down in France. IT’s possible to use X.25 over IP.