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WCF Interview Question - Name and explain types of security in WCF?
Answer:
In WCF there are two types of Security, transport level security and
message level security. Transport Security: Transport level security happens at the channel level.
Transport level security is the easiest to implement as it happens at the
communication level. WCF uses transport protocols like TCP, HTTP, MSMQ etc and
every of these protocols have their own security mechanisms. One of the common
implementation of transport level security is HTTPS. HTTPS is implemented over
HTTP protocols with SSL providing the security mechanism. No coding change is
required it’s more of using the existing security mechanism provided by the
protocol. Message Security: Message level security is implemented with message data
itself. Due to this it is independent of the protocol. Some of the common ways
of implementing message level security is by encrypting data using some standard
encryption algorithm. Below Diagram illustrate the concept of security in WCF. 
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