On 2009.05.19 at 16:46:14 +0530, naveen.bn wrote:

>    What is the contents on which CA would have signed from his private key. I
>    want to know it because if an attacker replaces his public key in the
>    server certificate which i get than its game over for me .

See RFC3280.

Block of signed data includes everything in certificate apart signature
itself. I.e. certificate is signed digital document which binds together
information of key owner and public key.

So, if attacker change public key in the certificate, CA's signature
becomes invalid.

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