Yogesh Bajpai
hi,
this is depending on which type of security mechnisum you required.you can use certificate base security alsohttp://www.codeproject.com/Articles/18601/An-easy-way-to-use-certificates-for-WCF-security
you must have to select proper binding for samehttp://msdn.microsoft.com/en-IN/library/ms731884.aspxhttp://wcfsecurity.codeplex.com/
hope this will help you.