From: Andreas Schildbach <andreas@schildbach•de>
To: bitcoin-development@lists•sourceforge.net
Subject: Re: [Bitcoin-development] Instant / contactless payments
Date: Fri, 07 Mar 2014 11:23:28 +0100 [thread overview]
Message-ID: <lfc6mi$qth$1@ger.gmane.org> (raw)
In-Reply-To: <CAJoe_wFeyFvxbd2nSD2yztJ_qjRQ=AKZj8pBOXs-ChKKbaZeuQ@mail.gmail.com>
On 03/07/2014 10:26 AM, Johannes Zweng wrote:
> In current phone implementations, the screen must be on already for NFC
> to be active. Also it must be unlocked, although I certainly hope future
> OSes will allow payment apps on the lock screen, just like they allow
> music players.
>
> Just a small input to this point:
> On Android 4.4 the new host card emulation (HCE) feature (aka: the phone
> emulates a ISO-DEP Smartcard and processes ISO7816-4 APDU commands like
> a Smartcard would do) only works when the display is on, but even when
> the screen is locked (can be changed with "android:requireDeviceUnlock"
> in Manifest). See here for detailled
> specification: http://developer.android.com/guide/topics/connectivity/nfc/hce.html
>
> Using the HCE API on Android 4.4 also has the beauty that any app that
> registers itself for HCE and sets its category to CATEGORY_PAYMENT in
> the Manifest automatically shows up in Adroid's system settings under
> "Tap & Pay" (where a user would expect payment applications).
Thanks for the pointer! Good to hear there is finally a decent
documentation for HCE.
Good news: HCE offers the required dispatch ability -- they call it AID
(Application ID).
Bad news: It seems - at least CATEGORY_PAYMENT - very credit card centric.
HCE seems to cover only the payer side. I wonder if there is also an API
for "reader emulation" which we would need for apps to support the payee
side.
Since Android 4.4 market penetration is quite far off, I suggest we
focus on the already established NFC payment protocol(s) for now, it
works pretty well. I will investigate into IsoDep and HCE and see if we
can make it enhance usability.
Interesting side note: They recommend messages transmitted via NFC to
not exceed 1 KB in order for a snappy experience. This (again) questions
usage of bulky X.509 certificates in our payment request messages.
Bitcoin Wallet currently does not sign payment requests, so I could not
try how it would feel.
next prev parent reply other threads:[~2014-03-07 10:23 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-06 9:45 Mike Hearn
2014-03-06 11:26 ` Andreas Schildbach
2014-03-06 13:44 ` Mike Hearn
2014-03-06 14:51 ` Andreas Schildbach
2014-03-06 16:55 ` [Bitcoin-development] Instant / contactless payments, IsoDep Andreas Schildbach
2014-03-06 17:00 ` Mike Hearn
2014-03-07 8:45 ` Andreas Schildbach
2014-03-07 9:26 ` [Bitcoin-development] Instant / contactless payments Johannes Zweng
2014-03-07 10:00 ` Mike Hearn
2014-03-07 10:23 ` Andreas Schildbach [this message]
2014-03-07 11:01 ` Mike Hearn
2014-03-07 12:00 ` Johannes Zweng
2014-03-06 14:20 ` Brooks Boyd
2014-03-06 17:07 ` Mike Hearn
2014-03-06 18:08 ` Brooks Boyd
2014-03-06 18:12 ` Mike Hearn
2014-03-06 18:20 ` Brooks Boyd
2014-03-06 18:24 ` Mike Hearn
2014-03-07 18:07 ` Joel Kaartinen
2014-03-06 14:39 ` Alex Kotenko
2014-03-06 16:46 ` Andreas Schildbach
2014-03-06 16:52 ` Mike Hearn
2014-03-06 18:03 ` Alex Kotenko
2014-03-07 8:59 ` Andreas Schildbach
2014-03-06 17:03 ` Mike Hearn
2014-03-06 18:49 ` Alex Kotenko
2014-03-08 8:52 ` Jan Vornberger
2014-03-10 15:09 ` Alex Kotenko
2014-03-10 19:28 ` Andreas Schildbach
2014-03-10 19:47 ` Alex Kotenko
2014-03-07 19:08 ` Troy Benjegerdes
2014-03-10 16:04 ` Mike Hearn
2014-03-10 16:14 ` Jean-Paul Kogelman
2014-03-10 16:27 ` Alex Kotenko
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