From: Mike Hearn <mike@plan99•net>
To: johannes@zweng•at
Cc: Bitcoin Dev <bitcoin-development@lists•sourceforge.net>,
Andreas Schildbach <andreas@schildbach•de>
Subject: Re: [Bitcoin-development] Instant / contactless payments
Date: Fri, 7 Mar 2014 11:00:21 +0100 [thread overview]
Message-ID: <CANEZrP3r3Xtv1BDK3k5u40xqa7WZn2G5NB6+-YGEbey60Wezgw@mail.gmail.com> (raw)
In-Reply-To: <CAJoe_wFeyFvxbd2nSD2yztJ_qjRQ=AKZj8pBOXs-ChKKbaZeuQ@mail.gmail.com>
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HCE is a bit scary. It's like the card companies tried the secure element
thing, decided the security was too hard and were like "screw it, let's
just use regular apps after all". Not that we're any better :)
At any rate, Bitcoin doesn't have any need to emulate smartcards as we
don't have any pre-existing infrastructure. We can just use a regular
non-smarcard-emulation ISO-DEP protocol. The new UI in Android 4.4 provides
some way to choose the default payment app, but I think it's only intended
to disambiguate between credit card providers. Everything else gets dumped
into CATEGORY_OTHER and I dunno what happens if you have multiple Bitcoin
wallet apps doing the same thing. Worst case, we can add some
disambiguation code on top, inside the apps themselves.
On Fri, Mar 7, 2014 at 10:26 AM, Johannes Zweng <johannes@zweng•at> wrote:
>
> 2014-03-06 12:26 GMT+01:00 Andreas Schildbach <andreas@schildbach•de>:
>
>
>
>> 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).
>
>
>
>
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next prev parent reply other threads:[~2014-03-07 10:00 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 [this message]
2014-03-07 10:23 ` Andreas Schildbach
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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