Did you forget security key (password) to a wireless network?
Do you want to check what password did someone type on your device?
What can you do?

Described method requires root access.
You also need a file explorer with access to root folders. I can recommend ES File Explorer File Manager (really powerful and user friendly app).

Open file explorer and go to folder /data/misc/wifi. 

Open file wpa_supplicant.conf in text viewer.
Now you can view all SSID names with saved Wifi passwords.

Really simple.

NOTE: It looks that in Android 4.3 this “trick” don’t work!

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