XML Encryption

[DCP Mexico]

I want to know about  tutorials on XML Encryption and  Signature  
tutorials.

Could you tell me where to start?
I make DCP (digital cinema packet )and I would begin to encrypt this  
information and use keys
thank you
--
Contacto: Ing. Gilardoni Ezequiel Digital Cinema Packeq Tel. de Ayuda  
5677-7100