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This question already has an answer here:

Say I type in my wifi password and press "Remember" or something. It should store it, either as a hash or plain text, in a file somewhere.

  1. Where is that file?
  2. Is it stored as a hash or plain text?

marked as duplicate by Ghanima Aug 17 '16 at 1:27

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    Check out this question (and answers) - raspberrypi.stackexchange.com/questions/2144/… – clickatwill Aug 15 '16 at 23:07
  • If a device is storing a password, without ever needing further input from you, it's stored in plain text. It may be obfuscated, but it won't be worth much in the terms of real security. How could a hashed wifi password possibly be useful for a client node? – Jacobm001 Aug 16 '16 at 16:30
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If you are using normal settings on Raspbian it will be in /etc/wpa_supplicant/wpa_supplicant.conf. It is stored in plain text, but only root can see it - you will need sudo to access the file.

See How do I set up networking/WiFi/Static IP for more detail.

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