Is the Advanced Security Pack required for windows authenticaion?
Yes, you will need Oracle Advanced Security to be installed. See http://docs.oracle.com/cd/E25054_01/network.1111/e10746/asointro.htm#i1008433

However a license for Oracle Advanced Security is no longer needed with 11g Release 2, but you will apparently need a license for "Oracle Identity Management Directory Services Plus".

See PDF page 10 of https://docs.oracle.com/cd/E11882_01/license.112/e47877.pdf


  Enterprise User Security is an EE feature for directory-based
  management of database users. It does require a corresponding Oracle
  Identity Management Directory Services Plus to be licensed. Usage of
  Enterprise User Security with Oracle Database strong authentication
  (PKI, Kerberos) no longer requires Oracle Advanced Security to be
  licensed.