System.Security.Authentication.ExtendedProtection Namespace

The System.Security.Authentication.ExtendedProtection namespace provides support for authentication using extended protection for applications.


The design of Integrated Windows Authentication (IWA) allows for some credential challenge responses to be universal, meaning they can be re-used or forwarded. If this particular design feature is not needed then the challenge responses should be constructed with, at minimum, target specific information and, at best, also some channel specific information. Services can then provide extended protection to ensure that credential challenge responses contain service specific information (a Service Provider Name or SPN) and, if necessary, channel specific information (a channel binding token or CBT). With this information in the credential exchanges, services are able to better protect against malicious use of credential challenge responses that might have been improperly obtained.



The System.Security.Authentication.ExtendedProtection.ChannelBinding class encapsulates a pointer to the opaque data used to bind an authenticated transaction to a secure channel.


The System.Security.Authentication.ExtendedProtection.ChannelBindingKind enumeration represents the kinds of channel bindings that can be queried from secure channels.


The System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy class represents the extended protection policy used by the server to validate incoming client connections.


The System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicyTypeConverter class represents the type converter for extended protection policy used by the server to validate incoming client connections.


The System.Security.Authentication.ExtendedProtection.PolicyEnforcement enumeration specifies when the System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy should be enforced.


The System.Security.Authentication.ExtendedProtection.ProtectionScenario enumeration specifies the protection scenario enforced by the policy.


The System.Security.Authentication.ExtendedProtection.ServiceNameCollection class is a read-only collection of service principal names.