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This question already has an answer here:

Please help me as I do not want to reset the password. I inherited this mac and I do not know the admin password but i aslo dont want to change it

marked as duplicate by Graham Miln, IconDaemon, user151019, Max Ried, nohillside Apr 22 '16 at 13:22

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    If it were that easy, it would be pointless – Tetsujin Apr 22 '16 at 8:45
  • Yes, I believe you are missing the point of password security on a computer. I think you will have to wipe the computer and start clean. – ArchonOSX Apr 22 '16 at 8:59
  • See apple.stackexchange.com/questions/57119/… for methods to reset an unknown administrator password. – Graham Miln Apr 22 '16 at 10:53
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OS X does not store a plain-text copy of your administrator password. This makes it impossible to have the computer show you the existing password.

OS X can only test if an attempted password is the administrator password.

OS X has no way to show you the original. The original is immediately thrown away when the password is set; only a hash of the password is kept.

Why? Hashed Passwords

Passwords are stored as mathematically derived hashes of the original. This hash makes it possible to determine if an attempted password matches the real password, but it also makes it impossible to determine the real password.

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Unless its linked to iCloud, in which case you would be able to reset it as if you'd reset your Apple ID password (not recover it), I believe there is no way of being able to do such thing. Not even change it.

  • "Not even change it"... You can change the password without having the password, it just requires being technically inclined and knowing your way around the Mac and the Terminal, as well as restarting a bit, and it isn't always doable, such as if FileVault is enabled. – Ryan Apr 22 '16 at 10:16

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