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Date: Mon, 2 Feb 2015 18:54:55 +0100
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From: =?UTF-8?Q?Martin_Habov=C5=A1tiak?= <martin.habovstiak@gmail.com>
To: Brian Erdelyi <brian.erdelyi@gmail.com>
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Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Proposal to address Bitcoin malware
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Good idea. I think this could be even better:

instead of using third party, send partially signed TX from computer
to smartphone. In case, you are paranoid, make 3oo5 address made of
two cold storage keys, one on desktop/laptop, one on smartphone, one
using third party.
If it isn't enough, add requirement of another four keys, so you have
three desktops with different OS (Linux, Windows, Mac) and three
mobile OS (Android, iOS, Windows Phone), third party and some keys in
cold storage. Also, I forgot HW wallets, so at least Trezor and
Ledger. I believe this scheme is unpenetrable by anyone, including
NSA, FBI, CIA, NBU...

Jokes aside, I think leaving out third party is important for privacy reaso=
ns.

Stay safe!

2015-02-02 18:40 GMT+01:00 Brian Erdelyi <brian.erdelyi@gmail.com>:
> Another concept...
>
> It should be possible to use multisig wallets to protect against malware.=
  For example, a user could generate a wallet with 3 keys and require a tra=
nsaction that has been signed by 2 of those keys.  One key is placed in col=
d storage and anther sent to a third-party.
>
> It is now possible to generate and sign transactions on the users compute=
r and send this signed transaction to the third-party for the second signat=
ure.  This now permits the use of out of band transaction verification tech=
niques before the third party signs the transaction and sends to the blockc=
hain.
>
> If the third-party is malicious or becomes compromised they would not hav=
e the ability to complete transactions as they only have one private key.  =
If the third-party disappeared, the user could use the key in cold storage =
to sign transactions and send funds to a new wallet.
>
> Thoughts?
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