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Application policies

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Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

Application policies

Application policies give you the important ability to decide which certificates can be used for certain purposes. This allows you to issue certificates widely without being concerned that they are misused for an unintended purpose.

Application policies are settings that inform a target that the subject holds a certificate that can be used to perform a specific task. They are represented in a certificate by an object identifier (also known as an OID) that is defined for a given application. This object identifier is included in the issued certificate. When a subject presents its certificate, it can be examined by the relying party to verify the application policy and determine if it can perform the requested action.

Application policies are sometimes called extended key usage or enhanced key usage. Because some implementations of public key infrastructure (PKI) applications may not understand application policies, both application policies and enhanced key usage sections appear in certificates issued by a Microsoft CA.