Below is explanation of how to prevent Mac password from being bypassed with software.
It’s possible to reset a password by booting into Recovery Mode or get it back from an external drive. But there are other ways to prevent password bypassed, such as
FileVault Disk Encryption software.
FileVault encrypts the information in your Mac therefore unauthorized users can’t access your files. If you are using OS X Yosemite, then you are currently using FileVault. To check if currently using FileVault, open System preferences, click Security & Privacy, and click the FileVault tab. To enable FileVault, click the lock in the lower –left corner to open it and enter your admin name and password. Next, you can click the Turn on FileVault button.
You’ll get a recovery key, which you’ll need if you wish to reset your password. Be sure to maintain this recovery key in a safe spot.
After a restart, FileVault will start to encrypt the files in your drive. You can still utilize your Mac while FileVault performs in the background, though its effectiveness might be a bit slow.
If someone might get your notebook and wipe your hard disk clear and start fresh, FileVault certainly doesn’t prevent a thief from using your Mac after a fresh install of new OS X. A firmware password is a hardware based encryption software that requires a password when booting to recovery mode or from an external hard drive.
How to prevent Mac password from being bypassed with software file vault disk encryption
To create a firmware password, you must reboot your Mac and enter Restoration Mode by holding down Cmd-R when it starts to boot up. If the OS X Resources screen appears, go through the Utilities menu and select Firmware Password Utility. Next , click Turn on firmware password button, then enter a password and click the set Password button. Lastly, click Quit Firmware Password Utility and Choose restart.
Note: Don’t lose of your firmware password. If you forget the password, take it to your nearest Apple Store to reset it.
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