Question

how cross certify two self-signed CAs

Asked by: itacyl

hello.

I have two self-signed CA's, one is a microsoft enterprise CA, and the other is a linux CA, created with openssl.
I want to use the certificates issued by enterprise CA for client authentication to a server (with an openssl certificate)
in other words I want that the certificates iussed by entreprise CA can be validated by linux CA.
How can I do this?

thanks and sorry for my poor english

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Asked On
2009-08-11 at 09:20:25ID24643673
Tags

openssl cross-certificate microsoft CA

Topics

SmartCards Security

,

Encryption for Network Security

,

Windows 2003 Server

Participating Experts
2
Points
500
Comments
7

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Answers

 

by: tdlewisPosted on 2009-08-11 at 09:30:22ID: 25070809

Each CA can issue a certificate for the self-signed root certificate of the other CA.

 

by: itacylPosted on 2009-09-07 at 03:43:54ID: 25274090

Hello

Sorry for no comment. I had backpain and i was at home a long time. I could not connect for add a comment.

I ask for keep this question open.

thanks

 

by: itacylPosted on 2009-09-07 at 15:08:34ID: 25277499

And how can the CA issued a certificate for the self-signed root certificate of the other CA??. What are the steps to achive this?

thanks

 

by: tdlewisPosted on 2009-09-08 at 16:06:35ID: 25286934

As you undoubtedly know, any CA is in the business of issuing certificates, that is, it creates a certificate with certain characteristics and signs that certificate.

In this case it needs it needs to create a certificate describing the other CA's certificate and then sign it.

Let's say that CA-A has a self-signed certificate with these fields:
Issuer: CA-A
Subject: CA-A

CA-B creates a certificate with these fields:
Issuer: CA-B
Subject: CA-A

and signs it.

(Note: There are a number of fields in a certificate and I only pulled out the issuer and subject fields because they are interesting for the case in point.)

For more information see http://en.wikipedia.org/wiki/Public_key_certificate

 

by: ParanormasticPosted on 2009-12-15 at 08:09:36ID: 26054140

A little bit late on this, just came across it, but thinking it might still be appreciated:

MS CA cross-signing (qualified subordination):
http://technet.microsoft.com/en-us/library/cc787276(WS.10).aspx

OpenSSL cross-signing example:
https://www.pki.virginia.edu/nmi-bridge/

20120131-EE-VQP-002

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