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How to setup Security of homegroup
http://www.softwaretipsandtricks.com/guides/articles/51/1/How-to-setup-Security-of-homegroup/Page1.html
By Super Admin
Published on 06/18/2011
 
Homegroup is protected by a password.

How to setup Security of homegroup
As we mentioned, a homegroup is protected by a password. The HomeGroup feature initially provides a password, but you can change it later if you want to. People who belong to a home network will not automatically belong to a homegroup and be able to connect to it. They will need a password which appears while you are setting up a HomeGroup before they can join the homegroup or see and access files and printers.