:: Re: [unSYSTEM] Stealth Bitcoin Addr…
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Skribent: Amir Taaki
Dato:  
Til: unsystem
Emne: Re: [unSYSTEM] Stealth Bitcoin Addresses
Twister is a big puzzle piece for making these crypto innovations
usable. I'm hoping the author switches to my proposed scheme otherwise
I'll need to fork because we need hard blockchain security only provided
by Bitcoin for financial applications.

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

>     >     >>> >

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

>     >     >>

>     >     >>
>     >     > _______________________________________________
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>     >     >

>     >

>     >
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>     >

>     >

>     >
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>     >

>
>
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>
>
>
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