Permission of some properties of user's profile

I added some properties to XWikiUsers so that users could fill it online and I could make statistics on them. Meanwhile, some of the properties are private so except the user and supervisors no one should have the permission to read them.
Are there some solutions for this?

Hello,

Actually all user can read users profiles but users can modify only his own.
Then you can use “Custom Display” in XWiki.XWikiUsers class.
In view mode, you can displayed your SuperSecretProperties at profile owner only:
http://www.xwiki.org/xwiki/bin/view/FAQ/Bindings%20available%20inside%20the%20Custom%20Display%20property

(of course Admin xwiki user could watch your values)
Pascal B