Description: Digital Certificates provide a third-party certification authority.
This brief tutorial provides a brief introduction to digital certificates, Certificate Authorities (CA), owners, public key encryption and other components.
In addition, this tutorial graphically explains how a digital certificate is "signed." Lastly, this tutorial explains how a digital certificate is verified provides "trust" and integrity and how Message Digests (MD) is used to provide an additional level of protection.
Tags: certificates , encryption ,
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I think this video needs more explanation. this is my doubt clearing link
http://support.microsoft.com/kb/195724