I think it is the Fingerprint , it is encrypted using private key of CA server 
and the client decode using ca public key and make hashing for the certificate 
and compare withe the decoded finger print 

Date: Wed, 12 Oct 2011 10:42:20 -0700
From: [email protected]
To: [email protected]
Subject: [OSL | CCIE_Security] Digital certificates

Hi guys,

In PKI, CA will digitally sign every certificate as a proof that he was the one 
who emitted the certificate .
This means that it will use it's private key to encrypt the hash product of the 
certificate.

Where can I find this information when I look at a certificate? Which component 
of a certificate is the Digital Signature
of the CA.

Thanks!
Oszkar


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