I rooted my HTC Desire 2.1 and I want to turn in into secure access point.
Is there any way I can do that?
I do want to make is secure so user has to enter password to get Internet access.
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Depending on what device you're using, Android Wifi Tether might work for you. It's also in the Market, but the Google code page has the most recent versions . It supports WEP, WPA, and MAC address filtering (they refer to this as "access control"). You may need a custom kernel for it to work - this again depends on your device/ROM.
You could also try one of the several other wireless tether apps that are currently in the Market. Some are free and some are not, but you can shop around a bit.
Yet another option would be to install CyanogenMod if your device is supported, since it has the AOSP wifi tethering built in.