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The CA is the most critical component of PKI Without CAs, there would be no digital certificates, and without digital certificates or public keys, there would be no digital signatures The CA controls all aspects of certificate management It is in charge of creating and then issuing the certificates to authorized users and computers If a certificate has been compromised, you can revoke it at the CA and it will be added to the Certificate Revocation List (CRL) A CA is nothing more than a certificate-generating entity What prevents anyone from generating certificates haphazardly and doing whatever they want with them Nothing! Anyone can set up a CA to work completely alone and issue certificates, and this is perfectly fine for certain applications In the real world, certificates are used to interact with entities across company boundaries You and another company can either add each other s root certificates to your list of trusted certificates, or you can configure your CA to be part of a larger hierarchy of CAs that implicitly trust one another For example, you can have your CA s root certificate cosigned by a trusted commercial CA that can vouch for your identity Large commercial CAs are responsible for verifying the identity of the person or entity that is either applying for one of the CA s certificates or seeking the ability to issue their own certificates Companies such as VeriSign perform these types of verification and signing services Essentially, they perform digital notarization of an individual s or company s credentials by issuing a certificate that is signed by their CAs If a CA becomes authorized to issue certificates as part of the certificate hierarchy, the CA will be issued a certificate of its own that is signed by the commercial CA that is automatically trusted by Windows operating systems Any certificate then issued will be implicitly cosigned by the parent CA, its parent, and so forth At the top of the certificate chain is always a root CA Since the root CA has no additional parent and is implicitly trusted by all its child CAs, it is typically held under heavy physical security and disconnected from the network to prevent any possibility of being remotely compromised VeriSign s root CAs usually fall within this category If you are creating your own internal CA hierarchy, you should consider heavily securing your root CA using the same precautions
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The Certificate Service that is part of Windows Server 2008 supports two different types of CA configurations: Enterprise and Stand-alone Both configurations can issue certificates The difference is in their dependencies, the types of certificates they can issue, and to what extent they can be used Each of these CA types can be used to create a certificate hierarchy comprising root CAs and subordinate CAs The creation of subordinates within an organization is typically used to delegate certificate management to smaller groups, where they can be more closely managed For example, if you are managing a global organization, you might use subordinate CAs to manage and control certificates issued for each country in which your company has a presence
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As you would expect, an Enterprise CA installation type requires Active Directory Domain Services (AD DS) to be in place Enterprise CA is designed to manually or automatically issue certificates to users, computers, and even child CAs You must be an Enterprise Administrator to install an Enterprise CA in your environment, which requires or uses the following technologies: Active Directory Group Policy to propagate certificates to client root certification authority stores Authentication to the domain using smart cards loaded with appropriate user certificates Enterprise Exit Module used to manage how certificates are handled after they are issued
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Since an Enterprise CA is heavily integrated with AD, it has the added advantage of being able to authenticate the user automatically with AD before issuing the appropriate certificate based on whatever template the user is requesting In addition, metadata typically associated with certificates, such as name and contact information, can be prepopulated using data obtained from AD Finally, by default, Enterprise CAs either accept or reject requests for certificates since they can quickly look up the criteria required to complete the request The CAs don t need to put the request in a pending state unless you explicitly configure them to do so
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