Re: [Bitcoin-development] Payment Protocol for Face-to-face Payments

[Alex Kotenko <alexykot@gmail.com>]

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Hmm, is there any other way to do it? Can we provide a signed payment
request and verify the sign on receiving side and this way protect from
bluetooth MitM attack? Quick googling showed that SSL over bluetooth isn't
a very well developed area, and my own skills are not enough to quickly
implement a reliable secure solution here.


2014-03-20 10:36 GMT+00:00 Mike Hearn <mike@plan99.net>:

> Encoding entire payment requests into qrcodes is definitely not the way to
> go. They can already be large when signed and we're just at the start of
> adding features.
>
> Finishing off and standardising the bluetooth support is the way to go
> (r=bt:mac). Andreas' app already has some support for this I believe, so
> Alex you could prototype with that, but we need to:
>
> 1) Add an encryption/auth layer on top, because it runs over RFCOMM
> sockets. The authentication would require proof of owning the Bitcoin key
> that's in the address part of the URI (which is needed for backwards compat
> anyway).
>
> 2) Write a BIP for it and make sure it's interoperable
>
> For the auth layer we could either use SSL and then just ignore the server
> certificate and require signing of the session public key with the Bitcoin
> key, which should be easy to code up but is rather heavy on the air, or
> roll a custom lightweight thing where we just do a basic ECDH, with the
> servers key being the same as the address key. But rolling such protocols
> is subtle and I guess it'd need to be reviewed by people familiar with such
> things.
>
> This feels like a good opportunity to grow the community - perhaps we can
> find a volunteer in the forums who enjoys crypto.
>
>
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