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I'm using a macmini with Mac OS X Snow Leopard to share a cable internet connection. Sharing works fine except that security is limited to 40/128 bit WEP that is insecure (can be hacked in minutes). Is it possible to share the connection via wifi with stronger WPA/WPA2 security? Maybe using some third-party internet sharing app?

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Use an AirPort Express instead of a Mac Mini to share the connection. The Mac internet sharing is seemingly designed for temporary ad hoc use. –  jaberg Apr 11 '12 at 15:06
    
possible duplicate of Can I secure a Mac's ad hoc network better than just the default WEP? –  Mark Apr 11 '12 at 22:29
    
The answer you marked is applicable to Mountain Lion, but your question says you're using Snow Leopard. Consider revising the question. –  zwerdlds Apr 8 '13 at 1:11

3 Answers 3

up vote 10 down vote accepted

Mac OS X Mountain Lion supports Internet Sharing using WPA/WPA2. You will need to upgrade to get this functionality. This article has a little more info. And here is a screenshot of the new option for WPA2 in Mountain Lion (10.8):

New WPA2 option for Internet Sharing in Mac OS X Mountain Lion

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Do I have to do something special to get this option? I'm on MacOS X 10.8.1, but I'm just offered "None", "40-bit WEP", and "128-bit WEP"... –  iGEL Sep 24 '12 at 8:18
    
Never mind. I tried to create a WIFI, but I had to enable internet sharing. I thought it would be the same... ;-) –  iGEL Sep 24 '12 at 8:46

This is not supported in Mac OS X 10.7 and lower. See:

  1. Can I secure a Mac's ad hoc network better than just the default WEP?

  2. http://docs.info.apple.com/article.html?path=Mac/10.6/en/8339.html

Perhaps in the next version of the OS, but currently Lion does not accommodate changing the encryption/authentication protocol of an ad-hoc network based from the device.

Though I have looked, there is no software to my knowledge that supports this feature aside from using a separate OS. You can dual boot: Some versions of Windows do support this feature.

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It seems that a work-around is to boot into an older version of the OS, configure WPA2, and then boot back.

I set up Internet Sharing a few OS versions ago, and the “Airport Setup” screen had a “Security” dropdown to choose between WEP, WPA, WPA2, and WPA2 Enterprise. Now, running 10.6.8, the “Security” dropdown is gone, and WEP seems to be the only choice. Yet, when I enable sharing on the machine, it still uses the previously-configured WPA2.

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So this setting is saved somewhere. Maybe it's a way to modify it without access to previous OS version? –  Eye of Hell May 22 '12 at 14:29
    
If @Randy or another Mac expert can locate the configuration file responsible (probably a .plist somewhere) I am sure a way can be found. –  dgw May 29 '13 at 18:10

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