Validating identity on windows xp

Some important considerations when deciding on the number and location of AIA paths include: To reduce the number of connections to an AIA publishing point and increase resiliency of certificate validation it is sometimes ideal to install CA certificates to the Intermediate Certification Authorities (Sub CA) store of validating clients.Use of the Sub CA store ensures that certificate validation continues without error when the AIA path written to the certificate becomes inaccessible.In general, three main areas of a certificate are checked during validation: In many cases, certificates are designed to provide identification of the computer or person holding the corresponding private key.

validating identity on windows xp-15

Key usage can be specified in either the "Key Usage" or "Extended Key Usage" attribute based on the validation requirements of the application.

The "Key Usage" field offers generic purpose validation based on the way an asymmetric key pair may be used as part of a PKI.

For a certificate to be considered valid the last CA in the chain must be installed in this container.

Like the Sub CA store, the Root CA store can be populated locally, through Group Policy, or through Active Directory configuration.

Values for the EKU field are defined in a number of different RFCs.

Some examples of extended key usages include: Another important part of validating a certificate is ensuring that it chains to a trusted root CA.This is a multivariate field that may consist of zero or more of the following uses: In some cases these basic key usages may not be enough to identify a very specific or important use of the public key.To address this need, the X.509 standard provides an additional field called Extended Key Usage (EKU).Validity of a certificate chain is confirmed by retrieving the issuer's certificate (by default from the certificate's AIA path) and comparing the issuing certificate's subject key identifier (SKI) entry with the issued certificate's AKI entry.As discussed in part 2 of this series, the SKI is populated with one of three values: the serial number of the certificate, a unique ID assigned by the signing CA, or any manner of identification listed as part of the General Name data type.When a CA issues a certificate the signing certificate's SKI is imprinted as the issued certificate's AKI prior to being signed thus asserting the relationship.

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