How to Protect Your Data with OS X Mavericks
Here are some features OS X Mavericks includes to protect your files from other users on your local area network and users with physical access to your Mac. If you don’t want anyone messing with your files, check out the security measures listed.
How to block or limit connections with OS X Mavericks
The first thing you may want to do is open the Sharing System Preferences pane by launching the System Preferences application (from the Applications folder, app menu, or Dock) and clicking the Sharing icon. Nobody can access your Mac over the network if all the services in the Sharing pane are disabled and your firewall is set to Block All Incoming Connections.
How to lock down files with FileVault with OS X Mavericks
If you absolutely, positively don’t ever want anyone to be able to access the files in your Home folder, FileVault allows you to encrypt your entire disk and protect it with the latest government-approved encryption standard: Advanced Encryption Standard with 128-bit keys (AES-128).
When you turn on FileVault, you’re asked to set a master password for the computer. After you do, you or any other administrator can use that master password if you forget your regular account login password.
If you turn on FileVault and forget both your login password and your master password, you can’t log in to your account — and your data is lost forever. Really. Not even DriveSavers has a hope of recovering it. So don’t forget both passwords, okay?
FileVault is useful primarily if you store sensitive information on your Mac. If you’re logged out of your user account and someone gets access to your Mac, there is no way they can access your data. Period.
Because FileVault encrypts your Home folder, some tasks that normally access your Home folder might be prevented. For one thing, some backup programs choke if FileVault is enabled. Also, if you’re not logged in to your user account, other users can’t access your Shared folder(s).
And because FileVault is always encrypting and decrypting files, it often slows your Mac when you add or save new files, and it takes extra time before it lets you log out, restart, or shut down.
To turn on FileVault, follow these steps:
Open the Security & Privacy System Preferences pane.
Click the FileVault tab.
Click the Turn on FileVault button to enable FileVault.
To turn off FileVault, click the Turn off FileVault button.