Back to My Mac is a feature in Mac OS X v10.5 and later that makes it easy to automatically connect to your other computers over the Internet. Once you've signed into MobileMe on your computer and enabled Back to My Mac, you may securely reach other computers via the Internet. The other computer(s) also must be signed into the same MobileMe account, be using Mac OS X v10.5 or later, and have Back to My Mac enabled on them. After completing a new installation of Mac OS X v10.5 or later, Back to My Mac is enabled by default, however, the computer cannot be reached until sharing services (such as File Sharing or Screen Sharing) have been enabled in Sharing preferences (in System Preferences). To ensure network connections between your computers are secure over the Internet, Back to My Mac uses a technology called IPSec to encrypt data. To provide secure and trusted authentication, Back to My Mac uses Kerberos with Digital Certificates. Kerberos provides an additional convenience; it eliminates the need for you to enter your username and password each time you wish to reach another computer in your Back to My Mac network. To learn more about Kerberos, see this article.
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