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I need to reset or delete my master password to FileVault 2. This is the password found under System Preferences > Users & Groups > Service gear > Change Master Password. It's a backup in case a user forgets his or her account password.

(I accidentally set said password before writing it down in an awkward keyboard fumble.)

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It's surprisingly simple.

  • Delete /Library/Keychains/FileVaultMaster.keychain
  • Delete /Library/Keychains/FileVaultMaster.cer

When you return to set a new password your old one will have been cleared.

Based on step 4 in How to create and deploy a recovery key for FileVault 2.

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