How can I connect to a wireless network without an encryption key?

There's a wireless network in the apartment complex I'm in. I have an adapter and I can see the networks, its just that I need a encryption key. Is there any way around that?How can I connect to a wireless network without an encryption key?
...but your neighbor won't be happy about itHow can I connect to a wireless network without an encryption key?
You need to decrypt it , Takes time effort and knowledge.

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