Hi Stefan,
IMHO that's nothing to be configured within XWiki but within the
deployment-dscriptor ("web.xml") within your servlet-container.
Example (snippet):
<security-constraint>
<web-resource-collection>
<web-resource-name>Protected Context</web-resource-name>
<url-pattern>/*</url-pattern>
</web-resource-collection>
<!-- auth-constraint goes here if you requre authentication -->
<user-data-constraint>
<transport-guarantee>CONFIDENTIAL</transport-guarantee>
</user-data-constraint>
</security-constraint>
Cheers
Gregor
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