:: Re: [unSYSTEM] Stealth Bitcoin Addr…
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Autor: Robert Williamson
Data:  
Para: System undo crew
Assunto: Re: [unSYSTEM] Stealth Bitcoin Addresses
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@???> 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>> 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>> 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>> 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

> >     >>> >

> >     >>> >
> >     >>> > _______________________________________________
> >     >>> > unSYSTEM mailing list: http://unsystem.net

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

> >     >>> >

> >     >>>

> >     >>>
> >     >>> _______________________________________________
> >     >>> unSYSTEM mailing list: http://unsystem.net
> >     >>> 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

> >     >>

> >     >>
> >     >> _______________________________________________
> >     >> unSYSTEM mailing list: http://unsystem.net
> >     >> https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/unsystem

> >     >>

> >     >>
> >     > _______________________________________________
> >     > unSYSTEM mailing list: http://unsystem.net
> >     > https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/unsystem

> >     >

> >
> >
> >     _______________________________________________
> >     unSYSTEM mailing list: http://unsystem.net
> >     https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/unsystem

> >
> >
> >
> > _______________________________________________
> > unSYSTEM mailing list: http://unsystem.net
> > https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/unsystem
> >
>
>
> _______________________________________________
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>
>