I'm trying to experiment with a Custom Security Token.  I'm going
through an article that comes with WSE 2.0  entitled "How to: Create a
Class Representing a Custom XML Security Token".  In the example, they
give the following constructor:

Public Sub New(ByVal serviceToken As SecurityToken)
       MyBase.New(XmlTokenNames.TypeNames.TokenType)
       ' Set the lift time
       _lifeTime = New LifeTime(DateTime.Now, 8 * 60 * 60)

       ' Now generate a key.
       _key = CType(KeyAlgorithm.Create("AES128"),
SymmetricKeyAlgorithm)
       _key.GenerateKey()

       ' Generate the encrypted form of the key
       _serviceToken = serviceToken
   End Sub 'New

There's no KeyAlgorithm anywhere.  I've been searching and can find no
sign of it.  I ran into a similiar problem with XmlTokenNames, but
finally discovered it was a custom class that I found in the quick
start examples.  I'm not so lucky with KeyAlgorithm.  I did find
something somewhere that seemed to imply that maybe this is something
that comes with VS2005.  I am still on 2003.  That being the case, can
I use this example?  If so, how do I get KeyAlgorithm?

Thanks in advance.