Re: [imi] Question regarding encryption

[John Bradley <jbradley@mac.com>]

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In the US ICAM profile for IMI auditing mode cards are required, but the =
IdP are restricted from using the information.

The practical problem is that the large IdP are not going to provide =
valuable verified attributes to unknown relying parties.
They want the ability to protect a user from sending there verified SSN =
and and other personal info to a Phishing site.

So in the US at-least there is no non-auditing option at the moment for =
the gov.   This puts IMI, SAML, openID and FPKI (the OCSP request gives =
away where the cert is used)  in the same boat.=20

So yes if a issuer was allowed to issue the card by the gov and a issuer =
chose to issue it, and the user understood the difference they could =
elect to use that card to protect there privacy from the issuer.

Part of the US situation is cultural.  They generally trust the private =
sector more than the government.   That is why they don't have a =
national ID.

Other jurisdictions may have different views on privacy. =20

I think however that it will be difficult to get issuers to put verified =
attributes on non auditing cards for a number of business related =
reasons.

If in the other-hand it was the Gov being the issuer I can easily see =
that as being non-auditing.

John B.
On 2009-12-07, at 10:22 AM, Mario Ivkovic wrote:

> Hi John,
>=20
> thanks for your quick response. I'll check how some of the publicly =
available IdPs handle non-auditing cards.
>=20
>> 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.
>=20
> I was thinking of a government-driven IdP where users probably don't =
want the IdP to know all services they use.
>=20
>=20
> kind regards,
>=20
> Mario
>=20
> John Bradley schrieb:
>> 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.
>=20
>> John B. On 2009-12-07, at 7:28 AM, Mario Ivkovic wrote:
>>> Hi all,
>>> I've a question regarding encryption and privacy. Maybe this has =
been already discussed and I missed it.
>>> A security token issued by an IdP is - if the IdP knows the =
certificate of the RP - encrypted with the RP's public
>>> key.
>>> 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.
>>> kind regards,
>>> Mario
>>> --
>>> 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
>>> =
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>=20
>=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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