Re: [imi] Question regarding encryption

[John Bradley <jbradley@mac.com>]

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Mario,

If a auditing mode card is not used,  there is no audience restriction =
in the SAML token.

The response is encrypted to the selector and then the selector encrypts =
it to the RP.

In both cases the RP receives a token encrypted with it's public key.

If the RP is not SSL the token is not encrypted to the RP in ether case.

Auditing or not is largely (read the spec for auditing optional) =
controlled by the issuer, and is pert of the card meta-data.

A user has control  by selecting a auditing card or a non-auditing card. =
 However the selectors don't show the user what sort of card it is.   =
They could do it, but the current ones don't to my knowledge.

In principal if a user doesn't want a IdP to know where they are using =
the card, they should use a p-card or choose a issuer they trust.

John B.
On 2009-12-07, at 7:28 AM, Mario Ivkovic wrote:

> Hi all,
>=20
> I've a question regarding encryption and privacy. Maybe this has been =
already discussed and I missed it.
>=20
>=20
> A security token issued by an IdP is - if the IdP knows the =
certificate of the RP - encrypted with the RP's public key.
>=20
> But if for some reasons the user doesn't want that the IdP knows the =
RP but still wants encryption this cannot be done. Is it possible to =
encrypt the token with a public key belonging to the user (card =
selector)? The user then decrypts the token, verifies it, and then =
encrypts it again with the RP's public key.
>=20
> kind regards,
>=20
> Mario
>=20
> --=20
>=20
> DI Mario Ivkovic
> A-SIT, Secure Information Technology Center - Austria
> Inffeldgasse 16a, A-8010 Graz, Austria
> Tel.: +43 (316) 873-5528  Fax.: +43 (316) 873-105521
> Mario.Ivkovic@a-sit.at
>=20
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