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certificate authority

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In many cases an organization may wish to use certificates that are only relevant for the organization and don't need to be valid for the internet as a whole.

For instance the organization may require that users or computers have a certificate in order to log on using 802.1x authentication. In these cases it's much simpler and cost effective to issue your own certificates rather than buying certificates from a commercial CA since the certificates only need to be recognized by the organizations own systems.