ray v wrote:
> Alicia,
> 
> Thank you for getting back to me
> 
> I need to take the Root CA certificate/private key and
> 
> change the modulus from 512 bit to 2048 bit. I assume
> that I have to make a new Root CA Certificate request
> and then sign it with the old one?

You cannot prolong the keys from 512 to 2048 bits,
so you will need to generate a completely new key.

The idea of additionally signing the new key with
the old one is perfectly valid in theory. On the
other hand: If you have to update the key of your
CA because the old one is too short (= not secure
any more), then the trust by such a signature is
limited.

And: You might run into troubles with some other clients
than IE or Outlook. The handling of cross certificates
is pretty poor in many applications. If this really
catches your interest, you might have a look at

http://www.dfn-pca.de/bibliothek/reports/pki-linking/

Regards, Olaf

-- 
Dipl.Inform. Olaf Gellert                  PRESECURE (R)
Senior Researcher,                       Consulting GmbH
Phone: (+49) 0700 / PRESECURE           [EMAIL PROTECTED]

                        A daily view on Internet Attacks
                        https://www.ecsirt.net/sensornet

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