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You can't. If you do not know it and there is no other computers connected to the same router, there is no way you can get the key without setting up a new one.

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Q: How do you find a wpa key for a wireless network without it hooked up to my computer?
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Difference between wired and wireless network?

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http://www.makeuseof.com/tag/secure-your-wireless-network-here-is-why-and-how/ visit this web and read http://www.makeuseof.com/tag/secure-your-wireless-network-here-is-why-and-how/


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