The certification validation server performs the validation of the certificate or the certificate chain (16).
The certification validation server carries out checks to determine whether the CRL includes the CertM, whether the validity date of CertM has expired or not, whether the "KeyUsage" field of CertM includes the "digitalSignature" value or not, and whether the "Issuer" field of CertM has the DN of the upper authority for the validation of the certificate or the certificate chain (9) [29].
If a transaction u passes certification, then the server must acquire write locks on all data items in u's writeset and then commit u.
Notice that although read and write commands are synchronized in a server, certification of update transactions is still needed since two update transactions executing on different servers may see inconsistent reads.
But desktop and server certification is only part of the story: SAN systems, database servers and more all need to be fully supported before they can be used in an enterprise.
To obtain certification beyond Windows Server 2003, consider the following certifications: Microsoft Certified System Administrator, Microsoft Certified Technology Specialist, or Microsoft Certified IT Professional.
The certification can be in Windows server system or in Linux server system.
First, the combiner figure and the servers acting as certification authorities produce system overload as all the communications requesting certification issuance and validation should be attended for them.
One can use SSL or TLS to authenticate the server using a mutually trusted certification authority.
The mCA preassigns a special role to several nodes called servers that constitute a distributed certification authority during the isolated period.
If the transaction fails certification, the client can retry using a different server.
