How to get correct wireless security protocol

[Sam Gardner]

Hi,
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I am using iwlist to get a list of wireless networks. The access point I am trying to connect to has the security protocol set to WPA2. However, sometimes when I run iwlist it is reporting it as WEP, since it does not report it as WPA2. I have also tried "wpa_cli scan; wpa_cli scan_results" and this sometimes misreports the security protocol too.
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Is there anyway, to get the correct security protocol for a wireless access point?
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I've tried "iw dev wlan0 scan", but cannot distinguish between open and WEP enabled access points. How can I do this?
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Kind Regards,
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Sam
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