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I have created an Ad Hoc network broadcasting from my iMac. Since I am on a University Campus I think it is likely that at least a few people know how to crack WEP. Is there any way on Mac to use WPA? I know it is possible with Windows.

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Although there's no easy way to do what you ask, a little more detail on what you are networking might allow us to rovide you with a solution. – bmike May 15 '12 at 3:39
I run my mac as the wireless access point. I have a linux laptop, a chromebook, my ipod and my phone which connect to the wireless. I have currently set it up using wep but feel it is insecure. – Shane Hudson May 20 '12 at 14:48
You're right - cracking WEP is a script kiddie type thing these days. Why not set up a VPN on the Mac and have that encrypt things? – bmike May 22 '12 at 2:04

I agree the hardware should handle it.

Apple says:

Apple really just wants you to buy an AirPort Extreme or Express.

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Hmm yes I have read that page, but this is surely a software limitation, is there no way around it? I am definitely not buying an AirPort, though might buy a cheap wireless router. Worried about using WEP as I know how easy it is to crack, and there are a fair few other Computer Science students in the building! Thanks anyway though for your reply. – Shane Hudson Mar 5 '12 at 19:13

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