|Lesson 8||Public and private CAs|
|Objective||Describe the difference between public and private CAs.|
|Using a public certificate server|
| You can demonstrate your identity to the public.|
You generally receive insurance coverage when you purchase a digital certificate.
A public digital certificate purchased from a reputable CA instantly increases public trust.
| You have to trust the security used by these CAs.|
Purchasing a certificate is costly.
|Using a private certificate server|
|Quick start-up: You can create your own key and get up and running right away.|
Relatively low cost: Because IIS 4.0 and Certificate Server, for example, are free, you can create your own trust system for no extracost.
You have local control over trust issues; you only have to worry about your own server being compromised.
|The chief drawback is that only users in your local intranet will trust your certificate. This will remain the case unless you become part of alarger trust system.|