From: Peter Todd <pete@petertodd•org>
To: Alan Reiner <etotheipi@gmail•com>
Cc: bitcoin-development@lists•sourceforge.net
Subject: Re: [Bitcoin-development] Stealth Addresses
Date: Mon, 13 Jan 2014 15:14:08 -0500 [thread overview]
Message-ID: <20140113201407.GB7941@petertodd.org> (raw)
In-Reply-To: <52D4458C.6010909@gmail.com>
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On Mon, Jan 13, 2014 at 02:59:08PM -0500, Alan Reiner wrote:
> How is this different from the proposal I have made?
>
> You distribute the root public key (but not chaincode!) of a BIP32
> branch. You can put your root key on a business card if you want. Then
> when someone wants to pay you, you simply give them the multiplier and
> root key (they already have the root key, but should verify). The
> multiplier does not reveal the chaincode, thus keeping it private, but
> it does allow them to confirm that the final address they are paying is
> derived from that root key they know belongs to you ("Please pay address
> X; oh btw, X=rootKey*mult").
>
> You can /choose/ to reveal that a given payment address is linked to
> your root key without any compromise of privacy. Or you can choose to
> ignore it and just give them a bare address the old way and still
> maintain privacy. What advantages does "stealth addresses" have over
> this scheme? You could extend it using some kind of deterministic
> sub-branching and/or ECDH to create multiple payment addresses without
> querying the payee.
Basically stealth addresses *are* your scheme, using the blockchain as a
low or even no overhead communication channel for the payor to give the
payee that multiplier without bidirectional communication.
In the business card example I can't easily take your business card and
just send you some money without that transaction being linked to public
information. (your business card)
> I had planned to implement this system and push for people to accept it
> because I don't see any downsides to it. It can easily be integrated
> into a WoT (with signed root keys), or CA system piggybacking on SSL.
WoT is a perfect example of the problem: if you put BIP32 branch payment
info into my OpenPGP key I can't pay you securely and reliably without
making the transaction public. The best I can do is pick a nonce and pay
X=rootKey*nonce, communicating to you the nonce later - this isn't
reliable because if I or you lose the nonce the funds are lost.
With stealth addresses the user experience can be as simple as you
telling me on the phone "hey! send me that 0.234 BTC you owe me!", me
clicking on "Send to Alan Reiner (verified by PGP)" (perhaps again on my
off-line second factor device for a multi-sig wallet) and tellling you
"OK, sent".
Even if your phone has been wiretapped, the attacker still didn't learn
exactly what transaction was actually used to make the payment - a big
advantage over per-tx nonce stuff.
--
'peter'[:-1]@petertodd.org
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next prev parent reply other threads:[~2014-01-13 20:14 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-06 12:03 Peter Todd
2014-01-08 10:20 ` Jeremy Spilman
2014-01-10 10:20 ` Peter Todd
2014-01-10 11:28 ` Drak
2014-01-10 12:00 ` Peter Todd
2014-01-12 10:33 ` Jeremy Spilman
2014-01-12 12:51 ` Mike Hearn
2014-01-12 18:20 ` Jeremy Spilman
2014-01-12 18:26 ` Mike Hearn
2014-01-13 9:13 ` Jeremy Spilman
2014-01-14 14:15 ` Peter Todd
2014-01-14 17:54 ` Odinn Cyberguerrilla
2014-01-12 21:18 ` Gavin Andresen
2014-01-13 9:52 ` Gregory Maxwell
2014-01-13 10:39 ` Mike Hearn
2014-01-13 13:37 ` Roy Badami
2014-01-13 15:58 ` Mike Hearn
2014-01-13 20:11 ` Roy Badami
2014-01-14 22:53 ` Roy Badami
2014-01-15 0:19 ` Drak
2014-01-15 20:22 ` Ben Davenport
2014-01-15 20:38 ` Gregory Maxwell
2014-01-15 20:44 ` Jeff Garzik
2014-01-15 22:38 ` [Bitcoin-development] Static addresses on chains encouraging address *RE* use Troy Benjegerdes
2014-01-15 23:01 ` [Bitcoin-development] Stealth Addresses Mike Hearn
2014-01-15 23:04 ` Roy Badami
2014-01-15 23:07 ` Jeff Garzik
2014-01-15 23:17 ` Roy Badami
2014-01-15 23:19 ` Roy Badami
2014-01-15 23:09 ` [Bitcoin-development] unlinakble static address? & spv-privacy (Re: Stealth Addresses) Adam Back
2014-01-16 1:02 ` Jeremy Spilman
2014-01-16 1:32 ` Gregory Maxwell
2014-01-18 17:44 ` Troy Benjegerdes
2014-01-18 20:25 ` Christophe Biocca
2014-01-20 11:11 ` Peter Todd
2014-01-21 4:00 ` Jeremy Spilman
2014-01-24 9:17 ` Peter Todd
2014-01-16 11:42 ` Adam Back
2014-01-16 18:19 ` Troy Benjegerdes
2014-01-16 0:05 ` [Bitcoin-development] Stealth Addresses Jeremy Spilman
2014-01-16 0:10 ` Gregory Maxwell
2014-01-16 0:24 ` Mark Friedenbach
2014-01-16 0:44 ` Eric Martindale
2014-01-16 6:26 ` Gary Rowe
2014-01-16 9:48 ` Wladimir
2014-01-16 1:16 ` Odinn Cyberguerrilla
2014-01-16 10:14 ` Drak
2014-01-16 10:19 ` Mike Hearn
2014-01-16 11:12 ` [Bitcoin-development] reusable address privacy problems & fuzzy bait limitations (Re: Stealth Addresses) Adam Back
2014-01-16 21:28 ` [Bitcoin-development] Stealth Addresses Peter Todd
2014-01-17 2:30 ` Johnathan Corgan
2014-01-17 3:13 ` Jeremy Spilman
2014-01-17 7:49 ` Drak
2014-01-17 9:15 ` Mike Hearn
2014-01-17 9:19 ` Mark Friedenbach
2014-01-17 9:23 ` Natanael
2014-01-17 9:59 ` Drak
2014-01-17 20:16 ` Cameron Garnham
2014-01-17 14:46 ` Peter Todd
2014-01-17 19:21 ` Ben Davenport
2014-01-18 4:55 ` Alan Reiner
2014-01-18 5:09 ` Gregory Maxwell
2014-01-18 23:12 ` Jeremy Spilman
2014-01-18 23:50 ` Gregory Maxwell
2014-01-20 11:08 ` Peter Todd
2014-01-13 19:53 ` Roy Badami
2014-01-13 19:57 ` Mike Hearn
2014-01-13 20:01 ` Roy Badami
2014-01-13 19:40 ` Roy Badami
2014-01-13 19:44 ` Drak
2014-01-13 19:59 ` Alan Reiner
2014-01-13 20:10 ` Gregory Maxwell
2014-01-13 20:15 ` Peter Todd
2014-01-13 22:02 ` Jeremy Spilman
2014-01-14 14:19 ` Peter Todd
2014-01-14 19:12 ` Jeremy Spilman
2014-01-14 20:48 ` Peter Todd
2014-01-14 21:51 ` Adam Back
2014-01-14 22:34 ` Jeremy Spilman
2014-01-13 20:14 ` Peter Todd [this message]
2014-01-13 20:41 ` Alan Reiner
2014-01-13 20:47 ` Gregory Maxwell
2014-01-13 21:02 ` Roy Badami
2014-01-13 21:15 ` Alan Reiner
2014-01-13 21:27 ` Peter Todd
[not found] ` <op.w9ne31oqyldrnw@laptop-air.hsd1.ca.comcast.net>
2014-01-14 12:10 ` Peter Todd
2014-03-06 12:23 ` Dan Carter
[not found] <mailman.417890.1389952750.21953.bitcoin-development@lists.sourceforge.net>
2014-01-17 12:16 ` joseph
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