Hi Nikhil,
You would configure HTTPS for Netweaver and MII since sits on Netweaver becomes HTTPS too.
To configure https, check the link
Configuring the Use of SSL on the AS Java - Network and Transport Layer Security - SAP Library
you could also check
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/705ba11c-2f35-2b10-2a93-9e9a86...
Regards
Tufale Ashai.