<div dir="ltr"><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">Thanks Anders</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">> <span style="font-family:Arial,Helvetica,sans-serif">Pardon my ignorance, but how can you skip "detached" without having the body Base64Url-encoded?</span></div><span class="gmail-im" style="color:rgb(80,0,80)">I<span class="gmail_default" style="font-family:"trebuchet ms",sans-serif"> mean that a full JWT should be sent in the header, rather than the so-called detached mode, where the JWS body is removed.</span></span></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, 24 Oct 2020 at 06:37, Anders Rundgren <<a href="mailto:anders.rundgren.net@gmail.com">anders.rundgren.net@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On 2020-10-23 15:40, Dave Tonge via Openid-specs-fapi wrote:<br>
> Dear WG<br>
<br>
Hi Dave,<br>
<br>
> <br>
> After looking in more detail at the proposed OBE signing spec, I'm really quite concerned and think that this WG should work on something else simpler as soon as possible.<br>
> <br>
> My suggestion is:<br>
> - abandon "detached" jwts<br>
<br>
Pardon my ignorance, but how can you skip "detached" without having the body Base64Url-encoded?<br>
<br>
<br>
> - build on dPoP by defining one additional claim - `htd` - the http body digest<br>
> - recommend that any info in headers that needs to be integrity protected is put in the body<br>
<br>
Good idea.<br>
<br>
<br>
> <br>
> So you would end up with a JWT with a standard header (no need for any `crit` claims), and a body that would be something like this:<br>
> <br>
> {<br>
> "jti":"-BwC3ESc6acc2lTc",<br>
> "htm":"POST",<br>
> "htu":"<a href="https://server.example.com/payment" rel="noreferrer" target="_blank">https://server.example.com/payment</a>",<br>
> <br>
> "htd":"SHA-256=+xeh7JAayYPh8K13UnQCBBcniZzsyat+KDiuy8aZYdI=", "iat":1562262616 } The `htd` value would be created according to the instructions in RFC3230<br>
> <br>
> Verification rules would be the same as dPoP, but with the addition of the verification of the `htd` value.<br>
> <br>
> The advantage of this approach:<br>
> - should be supported by all standard JWT libraries<br>
> - should be much easier to get interoperability as there aren't the same serialisation problems as draft-cavage or the OBE profile.<br>
> - only one additional claim needs to be registered in the IANA registry<br>
> <br>
> Any feedback?<br>
> <br>
> @anders - I know you will suggest rather using rfc8785, and I think that as a WG we should definitely keep monitoring support for that, but the reality is that at the moment there isn't widespread adoption.<br>
<br>
No big deal. I'm rather focusing on the "wallet" side of things where RFC 8785 fits like a glove. I'm just putting the "finishing touches" on a universal receipt mechanism which also uses RFC 8785.<br>
<br>
BTW, I believe the Open Banking community should carefully monitor <a href="https://github.com/rsolomakhin/secure-payment-confirmation#secure-payment-confirmation" rel="noreferrer" target="_blank">https://github.com/rsolomakhin/secure-payment-confirmation#secure-payment-confirmation</a> because if is succeeds it will most likely morph into a full-fledged "wallet" which [currently] is at odds with the Open Banking concept. FIDO + Chrome + Stripe and a team of devoted Googlers is a lethal combination! While the [fairly closed] banking community keep failing on a unified "SCA" solution, somebody else do that for them :)<br>
<br>
Cheers,<br>
Anders<br>
<br>
> <br>
> Thanks<br>
> <br>
> Dave<br>
<br>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div style="font-size:1em;font-weight:bold;line-height:1.4"><div style="color:rgb(97,97,97);font-family:"Open Sans";font-size:14px;font-weight:normal;line-height:21px"><div style="font-family:Arial,Helvetica,sans-serif;font-size:0.925em;line-height:1.4;color:rgb(220,41,30);font-weight:bold"><div style="font-size:14px;font-weight:normal;color:rgb(51,51,51);font-family:lato,"open sans",arial,sans-serif;line-height:normal"><div style="color:rgb(0,164,183);font-weight:bold;font-size:1em;line-height:1.4"><div style="font-weight:400;color:rgb(51,51,51);line-height:normal"><div style="color:rgb(0,164,183);font-weight:bold;font-size:1em;line-height:1.4">Dave Tonge</div><div style="font-size:0.8125em;line-height:1.4">CTO</div><div style="font-size:0.8125em;line-height:1.4;margin:0px"><a href="http://www.google.com/url?q=http%3A%2F%2Fmoneyhubenterprise.com%2F&sa=D&sntz=1&usg=AFQjCNGUnR5opJv5S1uZOVg8aISwPKAv3A" style="color:rgb(131,94,165)" target="_blank"><img alt="Moneyhub Enterprise" height="50" src="http://content.moneyhub.co.uk/images/teal_Moneyhub-Ent_logo_200x50.png" title="Moneyhub Enterprise" width="200" style="border: none; padding: 0px; border-radius: 2px; margin: 7px;"></a></div><div style="padding:8px 0px"><div style="padding:8px 0px"><div style="letter-spacing:normal;line-height:normal"><div style="padding:8px 0px"><span style="color:rgb(0,164,183);font-size:11px">Moneyhub Financial Technology, 5th Floor, 10 Temple Back, Bristol, BS1 6FL</span></div><span style="font-size:11px;line-height:15.925px;color:rgb(0,164,183);font-weight:bold">t: </span><span style="font-size:11px;line-height:15.925px">+44 (0)117 280 5120</span><br style="color:rgb(0,164,183);font-size:11px;line-height:15.925px"></div><div style="letter-spacing:normal;line-height:normal"><span style="font-size:11px;line-height:15.925px"><br></span></div><div style="color:rgb(97,97,97);font-family:"Open Sans";letter-spacing:normal"><div style="line-height:1.4"><span style="color:rgb(51,51,51);font-family:lato,"open sans",arial,sans-serif;font-size:0.75em">Moneyhub Enterprise is a trading style of Moneyhub Financial Technology Limited which is authorised and regulated by the Financial Conduct Authority ("FCA"). 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