On 03/05/2016 08:24 AM, ValdikSS wrote:
>
>
> On 03/05/2016 04:36 AM, Jan Just Keijser wrote:
>
> I've signed my new CA's private key (4096 bit) with old CA (1024 bit) and it 
> became intermediate to my old CA (what you call extending trust), but also 
> issued
> self-signed new CA. I issue server certificates with new CA.
>
> Current users trust only old CA, so to make them connect to the servers with 
> server certificates issued by new CA, we should either add cross-signed
> (intermediate) certificate on the client side, or push it from server. The 
> latest I'm trying to achieve.
>
> New clients will get configuration files with new CA inside, and they would 
> be able to successfully connect, since intermediate certificate, pushed from
> server, would be just ignored. Old clients would eventually update 
> configuration files too. After some time, we'll move all users to new CA and 
> remove
> intermediate certificate from server.
>
>
Just to clarify, both self-signed new CA and cross-signed new CA share the same 
private key.

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