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What is the purpose of certificate chaining?

Dave Trower
Ranch Hand

Joined: Feb 12, 2003
Posts: 86
I understand how certificating chaining works. But what I do not understand why it is used. Instead of having the root-CA sign certificate B and then have certificate B sign certificate A, why not just have the root-CA sign certificate A.
What purpose does the certificate in the middle serve?
 
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