What do you mean working with each other? 802.11g is the wireless protocol, which you can secure with WAP or WEP encryption and it would be called a secured wireless network. Also, it would be called a WLAN for wireless local area network. They're the same thing.
It encrypts data using AES It uses a 48-bit initialization vector to secure encrypted data
The three ways a wireless network can be secured and safe. First, by enabling WEP or WPA/WPA2 wireless security key or password on the router. Second, by enabling wireless MAC filter. And third, by disabling the SSID Broadcast of the router.
The secure hash standard
Use secure wireless network either WPA or WPA2-PSK. If you prefer to work in open networks (no encryption) you can use VPN connection to protect your activity.
Secure Digital Input/Output, Wireless Local Area Network card. SDIO is the new,secure, interoperability standard
If your computer only supports WEP encryption, but the wireless network uses WPA, you will not be able to connect to the network. However, most wireless networks can be configured to use WEP security or no security, which will allow you to connect. The trade-off is that the network becomes less secure. WEP encryption is possible to defeat, and turning off security will allow anyone connected to the network to view all data traffic, including private information. A better option may be to purchase a wireless adapter that supports WPA encryption. WPA was developed to fix the flaws of WEP, and is much stronger.
To make it secure you have to use encryption which is available in almost all routers.
The initial setup of a wireless connection infrastructure that implements security is not complicated as that of wired connections. The disadvantage of wireless security is that most of the encryption methods are common and have weaknesses.
It is important to enable data encryption to prevent unwanted access to your wireless modem.
# Harder to secure.
You don't really need to "secure" a folder to send it over the network as the wireless encryption takes care of it for you. You can use a third party folder encryption app or compress the folder and give it a password if you really want to have overkill. If you're just on a Home network, as in using it in your home, then all you need to do is set the wireless encryption to WPA-2 (it's the highest non commercial encryption) and everything you send to the other computers is encrypted. Depending on the uniqueness of the password, (length of password, how many numbers, random letters, uppercase letters, etc.) it could take years to decrypt even with a high end "cracker".