Thanks for Your reply.
But, if I understand correctly with X.509 handler, users(clients) just
expose X.509 certificate to server and if certificate is valid and trusted
user is authenticated. But I need signed challenge data to verify users
authentication (because of security reasons, anyone can have your
certificate).

On Tue, Feb 12, 2013 at 2:25 PM, Marvin Addison <[email protected]>wrote:

> > As I said, I want to authenticate to CAS via signing some data(about
> server)
> > with smartcard. So, I just pass some data (as challenge) to client, than
> > client sign passed data and try to authenticate. Server gets signed data,
> > check signature and authenticate(or not) the user.
>
> I believe other folks have used the X.509 handler for this purpose. I
> don't have any experience with smart cards, but I had the impression
> they implement the PKCS11 interface. (A brief scan of
> http://en.wikipedia.org/wiki/PKCS_%E2%99%AF11 suggests that's
> correct.) We use a hardware USB token that supports PKCS11 with the
> X.509 handler and it works splendidly. The involvement of the hardware
> to get at the private key is a client concern that's not relevant to
> the server. The server simply sees an X.509 certificate that it either
> trusts or not; additionally you can configure the server for
> certificate revocation using the CRL machinery. That's where the LDAP
> directory might come in; alternatively I'm aware of some PKIs that
> want to look up the cert in the directory as a means of certificate
> verification. You'd have to write your own code to do that, but you
> could probably leverage the CRL machinery as a starting point.
>
> M
>
> [1] https://wiki.jasig.org/display/CASUM/X.509+Certificates
>
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*Pozdrav,
Mihalj*

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