We have received many emails from Mac users on how to encrypt the information in their home folder. We recommend using FileVault.
Mac OS X includes FileVault, which allows you to encrypt the information in your home folder. FileVault creates a separate volume for your home folder and encrypts the contents of it. The data in your home folder is encoded and your information is secure if your computer is lost or stolen. FileVault uses the latest government-approved encryption standard, the Advanced Encryption Standard with 128-bit keys (AES-128).
When you turn on FileVault, you also set up a master password for the computer that you or an administrator can use if you forget your regular login password.
WARNING: If you turn on FileVault and then forget both your login password and your master password, you will not be able to log in to your account and your data will be lost forever.
If you store sensitive information on your computer, you should consider using FileVault. For example, if you carry all your company's financial data on your portable computer, losing it could allow someone else access to sensitive data that might hurt your business. If you are logged out of your account when your portable is lost, and FileVault is turned on, your information is safe.
Because your home folder is encrypted, some tasks that normally access your home folder may be prevented. For example: backup utilities may see your home folder as one that's always changing, and this could slow down your backup. Also, if you're not logged into your computer, other users will not have access to shared folders in your home folder.
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