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<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">Hi Michael,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">“The assertion from the old MNO” actually needs to be many assertions — one per RP — since it carries “the old MNO’s pairwise subject” (ie a RP-specific “sub”).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">So if a user has accessed 100 RPs, then during porting the old MNO need to generate, sign and send 100 JWTs, and the new MNO need to store these. Would we need limits?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">An old MNO might not know all the RPs a user has visited. It isn’t strictly necessary to record this if the per-RP pairwise sub is
<i>derived</i> whenever a login to that RP occurs. That would make it basically impossible to generate all the assertions at the porting time.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">Another disadvantage of generating all the per-RP assertions up front (at port time) is the privacy issue. The new MNO learns the user’s entire history, even if the user never intends
to visit some of the old RPs ever again.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US">Assertions that are generated at port time, but not consumed by an RP until the user next signs in to that RP (perhaps months later), means we need longer-term keys and revocation support.
In contrast to the current scheme that can operate with frequently-rotated short-term no-revocation-needed keys.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="color:#1F497D">--<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">James Manger<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Openid-specs-mobile-profile [mailto:openid-specs-mobile-profile-bounces@lists.openid.net]
<b>On Behalf Of </b>Engan, Michael<br>
<b>Sent:</b> Tuesday, 3 July 2018 8:52 AM<br>
<b>To:</b> Openid-specs-mobile-profile <openid-specs-mobile-profile@lists.openid.net><br>
<b>Subject:</b> [Openid-specs-mobile-profile] Moderna Feedback from T-Mobile<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Good Morning, I would like to offer up some feedback conversations to the working group on the following:
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">…</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l3 level1 lfo3">
<![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">AKA for Porting<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The US carriers have been discussing the AKA parameter for account porting. Ideally an ID_Token can be validated by an RP with only a cached public key for the carrier. Under the current suggestions the RP would now need
to make a request to the original carrier with any port_token to complete the validation. To go back to completely validated by the RP, we would like to see the AKA port token be something like a JWT, or JWE from the original carrier. This way the RP can
validate the id_token, and the port_token with cached jwk public keys from both the new and original MNO.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The assertion from the old MNO needs to carry at least<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="mso-list:l4 level1 lfo10"><span lang="EN-US">Acknowledgment from the old mno that the user has ported Out of the old MNO<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l4 level1 lfo10"><span lang="EN-US">Acknowledgement from the old mno that the user has ported TO the new mno.
<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l4 level1 lfo10"><span lang="EN-US">Confirmation what the old MNO’s pairwise subject was.
<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l4 level1 lfo10"><span lang="EN-US">Possibly a date of the PORT for use in anti-fraud detection.
<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US">It will remain up to the RP to update their subject from the old mno Sub to the new mno’s sub once AKA port_token validation is complete.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:Tele-GroteskFet;color:#1F497D">Michael Engan <br>
</span><span lang="EN-US" style="font-size:9.0pt;font-family:Tele-GroteskHal;color:#1F497D">Principal Systems Architect,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:Tele-GroteskHal;color:#1F497D">Authentication, Authorization, & API security</span><span lang="EN-US" style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;font-family:Tele-GroteskHal;color:#1F497D">12920 SE 38<sup>th</sup> Street | Bellevue, WA 98006<br>
Direct 425-383-2268 | Mobile 425-443-3463</span><span lang="EN-US" style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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