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Autor: Amir Taaki
Data:  
Para: unsystem
Assunto: Re: [unSYSTEM] [Bitcoin-development] DarkWallet Best Practices
it's not only these attacks we know of. there's probably better things
that we haven't yet thought of, that are being heavily researched right
now. just look at the tor paper by the NSA.

also tracking is dangerous. things like triangulating transactions and
originating IP addresses.

first step is to hinder flow analysis while assuming that our
infrastructure we provide is uncompromised (and give people the tools to
federate and construct their own).

On 27/12/13 22:51, Thomas Hartman wrote:
> I agree that switching to proof of stake isn't a plausible solution to the issues of transaction censorship. I think there would be a miner AND user revolt, and generally such a scheme would just fail to get buy in.
>
> However, I am not so optimistic that the market will take care of censorship because transaction mining will shift to jurisdictions with leniency.
>
> In theory this sounds right. Iin practice though transaction fees form a tiny part of overall miner reward, and this situation could plausibly continue for decades, and probably at least years.
>
> Miners are currently massively incentivized by block reward, transaction fees are just icing on the cake. And while many are sympathetic to privacy and libertarian concerns, mining is a business and business comes first.
>
> Rather what's needed, if financial privacy is the goal, is massive political AND social buy in. Technology can support this buy in, but it can't manufacture it.
>
> I'll try to go a little more technical now. Picking up from my earlier comment, there are (at least) two privacy attacks worth pondering
>
> 1) address registration
> 2) prohibition of mixing
>
> These are distinct scenarios. In particular, you could have address registration but tumbling permitted, so a state could form a picture of what everyone has and tax wealth; but not necessarily form a picture of the flows.
>
> One could also imagine a scenario where addresses are not required to be registered, but dark wallet style transaction tumbling is hounded into the shadows to the point where it only exists on the fringes. This one seems less likely to me, but not completely impossible. Such a scenario a state attacker (or maybe even a motivated detective agency) could probably form a picture of what addresses are linked using transaction flow analysis. However, tumbling could at least deter casual block chain analysis, on the level of casual clicking around in block chain.info
>
> The second scenario is quite inimical to dark wallet, and could result in the project essentially drifting into irrelevancy if it is carried out on a global scale.
>
> The first scenario is more interesting to me. Carried to its logical extreme, it would force states to tax wealth not income. And is this really so bad?
>
> In terms of arguing for buy in, I think it might also be worth it for dark wallet to consider NOT ONLY state attackers, but also attackers with more limited resources. I haven't fully thought this one through yet though, I admit.
>
> In particular, I wonder if it behooves dark wallet to adopt a position of agnosticism towards address registration, and focus its argument and lobbying rather on hindering flow analysis.
>
> Address registration is going to be a fight in 2014, wherever there are governments and bitcoin. But does it need to be dark wallet's fight?
>
>
>
>
>
> On Dec 27, 2013, at 12:36 PM, Jorge Timón wrote:
>
>> I don't think this kind of legal attack is very realistic.
>> While there's miners that don't censor txs with "unregistered
>> addresses", all those transactions can go trough them.
>> Say the US tries to enforce white lists through US-based pools.
>> There will be other pools in other countries or even in tor.
>> Are they going house by house looking for ASIC buyers? Mining the
>> transactions with the highest fees instead of only the "white ones"
>> will always be more profitable, so they're really only pushing mining
>> out of the country and making the local miners who try lose money on
>> their investments because they can't compete with foreign miners.
>> Which country will copy those regulations next? After seeing that
>> produce undesirable economic results and at the same time don't impede
>> transactions with addresses outside of their white-listing centralized
>> server?
>> The idea of a centralized white-list server for a p2p currency is so
>> stupid that failure is the only possible outcome I contemplate.
>> But even if this ever became a real problem, we could always switch to
>> a less efficient system that guarantees anonymity ala zerocoin or
>> other similar proposals.
>>
>> So, Daniel, I completely disagree with your analysis, but I'm curious
>> as to what's your proposed replacement for PoW. I guess you want
>> something like proof of stake or ripple.com's consensus?
>> Both have much bigger problems than PoW.
>>
>>
>> On 12/23/13, Metatron YHVH <metatrongone@???> wrote:
>>> So if the powers that be can set up god tier mining pools, then how is this
>>> even fair?
>>>
>>> The fiat currency of today is still governing who has how much and that
>>> doesn't give me much hope for crypto currencies as a whole.
>>>
>>> Moreover, I don't like politics however, as soon as those bastards on
>>> C-Span made bitcoin apart of the conversation, bitcoin became a political
>>> topic.
>>>
>>> The Dark Wallet is a good idea, but it doesn't matter what technology you
>>> have, as long as people influence (or govern) the USERS, you might as well
>>> sign up a coinbase account.
>>>
>>> - Metatron
>>>
>>>
>>> On Mon, Dec 23, 2013 at 11:16 AM, Daniel Larimer <
>>> dlarimer@???> wrote:
>>>
>>>> The solution is to move away from Proof-of-Work based coins.
>>>>
>>>>
>>>> On Dec 23, 2013, at 1:59 PM, Thomas Hartman <thomas@???>
>>>> wrote:
>>>>
>>>>> Mining is moving to an industrial model, giant shipping containers
>>>>> full of gear that costs millions of dollars. Regulation by the state
>>>>> seems almost inevitable to me.
>>>>>
>>>>> So I think if the state and regulators can capture miners and force
>>>>> them to only clear transactions to registered addresses, what can a
>>>>> technology such as darkwallet do?
>>>>>
>>>>> This is a political fight, isn't it?
>>>>>
>>>>> The freedom to have an unregistered address (financial privacy) is
>>>>> either a basic human right, recognized by governments and citizens
>>>>> across the globe (and >51% of miners), or it isn't.
>>>>>
>>>>> If there is regulatory capture of the miners, my understanding is dark
>>>>> wallet could still provide obfuscation of FLOWS, even though balances
>>>>> would be transparent. So, the government could tax your bitcoin but
>>>>> they might not know where it came from. It's still more freedom than
>>>>> every flow being known and datamined.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Mon, Dec 23, 2013 at 9:58 AM, Amir Taaki <genjix@???> wrote:
>>>>>> Freezing BitCoin addresses by regulating miners, April 2011
>>>>>> https://bitcointalk.org/index.php?topic=5979.0
>>>>>>
>>>>>> "Whilst I think it's inevitable, this sort of legal framework would
>>>>>> ultimately be self regulating and so should not be feared. BitCoin is
>>>>>> a
>>>>>> system for agreeing on a global consensus around the ordering of
>>>>>> transactions. If that consensus is truly a consensus then there will
>>>>>> no
>>>>>> be real controversy over the freeze orders and few (or no) miners will
>>>>>> ignore them. Consider temporarily freezing the assets of Gadaffi or
>>>>>> Mubarak as examples."
>>>>>>
>>>>>> pushing blacklists from way back when.
>>>>>>
>>>>>> On 23/12/13 16:22, Thomas Hartman wrote:
>>>>>>> Short answer no, long answer barely.
>>>>>>>
>>>>>>> Node distribution of miners has some impact on centralization of
>>>>>>> power,
>>>>>>> which has implications for state and regulatory capture of bitcoin.
>>>>>>> And
>>>>>>> in the long run DW may want to lobby the miners to prioritize certain
>>>>>>> types of transactions.
>>>>>>>
>>>>>>> In the short run I think we don't need to think about mining.
>>>>>>>
>>>>>>> On Dec 22, 2013 10:02 PM, "Metatron YHVH" <metatrongone@???
>>>>>>> <mailto:metatrongone@gmail.com>> wrote:
>>>>>>>
>>>>>>> Is mining relevant here?
>>>>>>>
>>>>>>>
>>>>>>> On Sun, Dec 22, 2013 at 9:36 AM, Thomas Hartman
>>>>>>> <thomas@??? <mailto:thomas@standardcrypto.com>>
>>>> wrote:
>>>>>>>
>>>>>>>       Well, at least you posted some budget and a spec.

>>>>>>>
>>>>>>>       You still hijacked the thread (3 threads) though. If you would
>>>> at
>>>>>>>       least start a new thread, it would be somewhat more socially
>>>>>>>       acceptable.

>>>>>>>
>>>>>>>       On Sun, Dec 22, 2013 at 8:49 AM, Metatron YHVH
>>>>>>>       <metatrongone@??? <mailto:metatrongone@gmail.com>>
>>>>>>> wrote:
>>>>>>>> Bitcoins and RFID currency. I've got 7,692 USD to anyone who
>>>>>>>       prove they are
>>>>>>>> different.

>>>>>>>>
>>>>>>>>
>>>>>>>> On Sun, Dec 22, 2013 at 7:47 AM, caedes <caedes@???
>>>>>>>       <mailto:caedes@sindominio.net>> wrote:

>>>>>>>>>
>>>>>>>>> Hi!
>>>>>>>>>
>>>>>>>>> On 19/12/13 18:23, Mike Belshe wrote:
>>>>>>>>>> Hey Peter -
>>>>>>>>>>
>>>>>>>>>> I think this is a super list. A couple of thoughts:
>>>>>>>>>>
>>>>>>>>>> a) In the section on multi-sig and multi-factor, I think we
>>>>>>>       can split
>>>>>>>>>> these apart. Multi-factor user authentication is very
>>>>>>>       valuable and not
>>>>>>>>>> the same as multi-factor signing, which is a second level of
>>>>>>>>>> complexity.   The multi-factor auth can be off-blockchain, e.g.
>>>>>>>>>> authenticating with SMS message to your phone or Google
>>>>>>>       Authenticator
>>>>>>>>>> challenge.  Given the state of malware today, I personally
>>>>>>>       would
>>>>>>>>>> propose two requirements:
>>>>>>>>>>   1) wallets SHOULD use multi-factor authentication before
>>>>>>>>>> authorizing access to a wallet (e.g. view balances, addresses,
>>>>>>>>>> transactions, etc)
>>>>>>>>>>   2) wallets MUST use multi-factor auth before signing a
>>>>>>>>>> transaction.   [note: I recognize that MUST might be too
>>>>>>>       aggressive
>>>>>>>>>> right now, but I wouldn't use a wallet without it.  this
>>>>>>>       can also be
>>>>>>>>>> impractical for server-side wallets]

>>>>>>>>>
>>>>>>>>> Using multi-sig for multi-factor so the wallet needs to get some
>>>>>>>>> additional signatures (or even the keys can be somewhere
>>>>>>>       else) can make
>>>>>>>>> 2factor more orthogonal to the whole thing specially since we
>>>>>>>       need to
>>>>>>>>> support multisig spending, and other partial transaction
>>>>>>>       fullfilling.

>>>>>>>>>
>>>>>>>>> We can still account for other 2fa schemes, but i'm thinking
>>>>>>>       more of
>>>>>>>>> exploiting key signing itself and maybe bip32 wallet structure.

>>>>>>>>>
>>>>>>>>> I agee on uour requirements, but also think they might be too
>>>>>>>       harsh for
>>>>>>>>> some uses I would require them myself so I could feel safe
>>>>>>>       with my wallet.

>>>>>>>>>
>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> b) Multi-factor signing (e.g. P2SH) may be too early to
>>>>>>>       really define.
>>>>>>>>>> But here are some issues which have come up from my own
>>>>>>>       personal
>>>>>>>>>> development experience:
>>>>>>>>>>   - Wallets SHOULD NOT create two keys on a single host
>>>>>>>       or device
>>>>>>>>>>   - Wallets SHOULD provide a way to import external
>>>>>>>       public keys
>>>>>>>>>> which can be used as part of a P2SH address

>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Agree on these ones. Public keys could be imported through
>>>>>>>       extended
>>>>>>>>> public keys too if we agree to using those.

>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Slightly off topic:  For P2SH, address creation requires
>>>>>>>       the public
>>>>>>>>>> key, not the public hash of an address.  For me, this has
>>>>>>>       made it
>>>>>>>>>> difficult to import keys created through out-of-band
>>>>>>>       sources.  Most
>>>>>>>>>> wallets/key generators/etc only provide the address and not
>>>>>>>       the public
>>>>>>>>>> key, and this is a hinderance to easy P2SH creation off
>>>>>>>       host.  It
>>>>>>>>>> would be great if there were a way to address this, but I
>>>>>>>       don't know
>>>>>>>>>> how.

>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> We have to work on solutions... our aim is settle down on a
>>>>>>>       way to
>>>>>>>>> negotiate addresses and other parameters among identities,
>>>>>>>       also key
>>>>>>>>> importing can be supported to make these easier.

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

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