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Subject: Re: [imi] SAML 2 profile questions
--Apple-Mail-307-282678781 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii; format=flowed; delsp=yes I can't comment on Microsoft's shipping implementation working, only that I believe they intended to support HoK to a RP/STS. Mike M. can may be able to enlighten us on the what IBM has for this. I agree that it would take some bending of definitions to convince some folks that it is HoK as defined in LoA 4. I think that this should be a separate work item from the SAML 2 profile. I think we need to add a way to have one time keys, or something like that to improve the security on non-auditing cards. Perhaps a restful service on the RP that generates a WS-Security policy like doc that the selector can retrieve. That way you could have the one time key in that. We also need a much more credible story on HoK (or equivalent) all the way to the RP web site. I don't think these issues are directly related to the SAML 2.0 profile. John B. On 2009-10-15, at 1:07 AM, Scott Cantor wrote: > John Bradley wrote: >> HoK requires a RP/STS or some special undocumented undefined >> browser magic. > > True HoK means it's HoK all the way to the web site, so the RP/STS > thing doesn't count for my purposes. So the first question to answer > is whether that's strictly legal or not, regardless of whether > Cardspace itself happens to support it. If it is, then I'll stop > criticizing IMI on this basis. But none of this really pertains to > this profile, it's a separate issue. > >> Has anyone ever looked at doing one time audiance restriction? > > Do you mean one time keys? I certainly have. > >> If the RP made up a self signed certificate per transaction or >> symmetric signing key. >> This is venturing beyond the SAML 2.0 profile. But some of these >> issues need a broader view. > > It's my assumption that with something like Infocard, you would > quite likely look at using one-time or at least frequently recycled > keys, and could support HoK by authenticating in the usual fashions > to the IdP but also sign the RST with a key so that it can bind that > key to the token on the way out without knowing ahead of time that > it's your key. This isn't preventative of MitM attacks if the > authentication step itself isn't via certificate, of course, but > it's still an improvement for the RP half. > > -- Scott --Apple-Mail-307-282678781 Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjTCCA2gw ggLRoAMCAQICEB33j5shi+K5JpDD+pT/JY8wDQYJKoZIhvcNAQEFBQAwYjELMAkGA1UEBhMCWkEx JTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMTI1RoYXd0ZSBQ ZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBMB4XDTA4MTIxMjAxNTQzMVoXDTA5MTIxMjAxNTQz MVowgZ8xHzAdBgNVBAMTFlRoYXd0ZSBGcmVlbWFpbCBNZW1iZXIxHzAdBgkqhkiG9w0BCQEWEGpi cmFkbGV5QG1hYy5jb20xHjAcBgkqhkiG9w0BCQEWD2picmFkbGV5QG1lLmNvbTEdMBsGCSqGSIb3 DQEJARYOdmU3anRiQG1hYy5jb20xHDAaBgkqhkiG9w0BCQEWDXZlN2p0YkBtZS5jb20wggEiMA0G CSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDEHYYZtnmnyZW2DXoJINd4XwXcP7mxuzwvhv9ise38 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