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Auteur: Robert Williamson
Date:  
À: System undo crew
Sujet: Re: [unSYSTEM] Stealth Bitcoin Addresses
Reading through this now and on irc, might not reply straight away.


On 15 January 2014 14:11, Amir Taaki <genjix@???> wrote:

> Robert, maybe you're interested to participate in this conversation:
>
> https://groups.google.com/d/msg/twister-users/cgxyB2oOQkk/Ov-MUUv3uG4J
>
> Also about the secret, it allows you to put a static address somewhere
> and receive anonymous payments. It doesn't preclude treating the address
> itself like a secret though and sending that over a special channel like
> Twister uniquely to different participants. You don't have to send
> everyone the same address.
>
> Together with those 3 schemes 1) Twister transmission 2) Stealth
> addresses 3) CoinJoin, we have very strong financial privacy.
>
> Are you on IRC ever? I'm in Freenode #darkwallet. I've got some
> questions if you're around in next few days for some minutes.
>
> On 15/01/14 13:19, Robert Williamson wrote:
> > Ah this has all just clicked with me, using Diffie-Hellman to create a
> > shared secret then using that to encrypt the nonce.
> >
> > This could also be used for generating a temporary/disposable aes key
> > for encrypting messages between people.
> >
> > satoshi mentioned that storing data in the blockchain or anywhere
> > publicly might be a bad idea as if you had your private key compromised
> > then all the data would be revealed.
> >
> > https://bitcointalk.org/index.php?topic=25.msg159#msg159 (post 10)
> >
> > Doing private messages/etc over twister or another distributed platform
> > this is probably a good way to do it securely without having your key
> > attached to every message that is sent.
> >
> > Thanks
> > Bob
> >
> >
> >
> >
> >
> > On 15 January 2014 12:33, Amir Taaki <genjix@???
> > <mailto:genjix@riseup.net>> wrote:
> >
> >     some code: https://gist.github.com/jspilman/8396495

> >
> >     On 15/01/14 03:57, Thomas Hartman wrote:
> >     > Awesome if true.
> >     >
> >     > On Jan 14, 2014 5:38 PM, "Amir Taaki" <genjix@???
> >     <mailto:genjix@riseup.net>
> >     > <mailto:genjix@riseup.net <mailto:genjix@riseup.net>>> wrote:

> >     >
> >     >     I'm not sure that's true (asked Peter about it):

> >     >
> >     >     <petertodd> stealth addresses are "I give you a chain code, you
> >     >     derive new
> >     >     pubkeys with random 32-byte nonces, and then encrypt that
> nonce in
> >     >     the tx
> >     >     itself so I can decrypt it and recover the funds"

> >     >
> >     >     if so then combined with CoinJoin this is holy-grail, and we
> don't
> >     >     need to
> >     >     worry about Twister/XMPP/BitMessage for transmitting secrets
> >     around.

> >     >
> >     >     > So sad that you're fed up with me.

> >     >     >
> >     >     > This seems great for fairly anonymous payments.

> >     >     >
> >     >     > My only problem is if the deterministic offset n is encoded
> >     in the
> >     >     paying
> >     >     > transaction then anyone else you also gave that mpk to, will
> >     also
> >     >     see the
> >     >     > address.

> >     >     >
> >     >     > So I still really prefer some solution where payment
> >     addresses are
> >     >     > contracted and signed by a key, for either a one off payment
> >     or a
> >     >     sequence
> >     >     > of payments over a period.

> >     >     >
> >     >     > Thanks
> >     >     > Bob
> >     >     > On 14 Jan 2014 00:31, "Nicolás Mendoza"
> >     <nicolasmendo@??? <mailto:nicolasmendo@gmail.com>
> >     >     <mailto:nicolasmendo@gmail.com
> >     <mailto:nicolasmendo@gmail.com>>> wrote:

> >     >     >
> >     >     >> Thanks for using Drak in your example, I'm fed up with Bob
> >     and Alice

> >     >     >>

> >     >     >>
> >     >     >> On Tue, Jan 14, 2014 at 5:29 AM, Amir Taaki
> >     <genjix@??? <mailto:genjix@riseup.net>
> >     >     <mailto:genjix@riseup.net <mailto:genjix@riseup.net>>> wrote:

> >     >     >>
> >     >     >>> great, thanks for showing me this. I know the basic idea.
> >     The only
> >     >     >>> thing
> >     >     >>> I'd add is that once you know the nonce, that the payor
> >     doesn't
> >     >     need to
> >     >     >>> recreate these txs repeatedly. So when I pay Drak, I only
> >     need to do
> >     >     >>> this the first ever time I pay Drak.

> >     >     >>>
> >     >     >>> On 13/01/14 19:49, Drak wrote:
> >     >     >>> > Have you guys seen this discussion on the bitcoin
> >     mailing list
> >     >     (and
> >     >     >>> now
> >     >     >>> > there is a working
> >     >     >>> > implementation):

> >     >     >>>
> http://sourceforge.net/mailarchive/message.php?msg_id=31813471

> >     >     >>> >
> >     >     >>> > Seems to be a major step forward in terms of privacy.
> >     Probably
> >     >     needs
> >     >     >>> a
> >     >     >>> > few more technical eyes on it but it looks really
> promising.

> >     >     >>> >
> >     >     >>> > Drak

> >     >     >>> >

> >     >     >>> >
> >     >     >>> > _______________________________________________
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> >     >     >>> >
> >     https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/unsystem

> >     >     >>> >

> >     >     >>>

> >     >     >>>
> >     >     >>> _______________________________________________
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> >     >     >>>
> >     https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/unsystem

> >     >     >>>

> >     >     >>>

> >     >     >>

> >     >     >>
> >     >     >> --
> >     >     >> Nicolas Mendoza

> >     >     >>
> >     >     >> PhD Researcher
> >     >     >> School of Creative Media
> >     >     >> City University of Hong Kong
> >     >     >> China PDR - HKSAR

> >     >     >>

> >     >     >>
> >     >     >> _______________________________________________
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> >     >     >>
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> >     >     >>

> >     >     >>
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> >     >     >
> https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/unsystem

> >     >     >

> >     >

> >     >
> >     >     _______________________________________________
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> >     >
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> >     >

> >     >

> >     >
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> >     >

> >
> >
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> >
> >
> >
> >
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>
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