From: William Yager <will.yager@gmail•com>
To: Pavol Rusnak <stick@gk2•sk>
Cc: Bitcoin Dev <bitcoin-development@lists•sourceforge.net>
Subject: Re: [Bitcoin-development] [RFC] Proposal: Base58 encoded HD Wallet root key with optional encryption
Date: Wed, 12 Mar 2014 15:37:35 -0500 [thread overview]
Message-ID: <CAG8oi1OAYRgaMtoT8pMGNrcLomz9+dgi-7WKN285F0U4=LJSmQ@mail.gmail.com> (raw)
In-Reply-To: <5320C27B.8090205@gk2.sk>
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On Wed, Mar 12, 2014 at 3:24 PM, Pavol Rusnak <stick@gk2•sk> wrote:
> On 03/12/2014 09:10 PM, William Yager wrote:
> > implement this is to allow semi-trusted devices (like desktop PCs) to do
> > all the "heavy lifting". The way the spec is defined, it is easy to have
> a
> > more powerful device do all the tough key stretching work without
> > significantly compromising the security of the wallet.
>
> By disclosing "preH" to compromised computer (between steps 4 and 5) you
> make further steps 5-9 quite less important.
>
>
Yes, that was my chief complaint as well. A compromised computer removes
most of the extra security offered by key stretching (should you choose to
outsource the bulk of your key stretching).
However, I think we have a good compromise, which is the inclusion of a
number of PBKDF2-HMAC-SHA512 based KDFs. For anyone who doesn't want to
trust any external device, but also wants to use memory-contrained devices
(that group of people includes me), PBKDF2-HMAC-SHA512 is very easy to
implement even on devices that only have a few kB of RAM, and even though
our number of rounds is very aggressive (2^16 and 2^21), it will still run
in reasonable time even on very slow embedded ARM processors.
Will
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next prev parent reply other threads:[~2014-03-12 20:37 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <op.w0hd2nthyldrnw@laptop-air>
2013-07-19 18:15 ` [Bitcoin-development] [RFC] Proposal: Base58 encoded HD Wallet master seed " Jean-Paul Kogelman
2013-07-22 13:14 ` Mike Hearn
2013-07-22 14:33 ` Jean-Paul Kogelman
2013-07-22 21:37 ` Jean-Paul Kogelman
2013-11-16 2:47 ` Gregory Maxwell
2013-11-16 3:09 ` Jean-Paul Kogelman
2013-12-26 11:48 ` Jean-Paul Kogelman
2014-03-12 3:17 ` [Bitcoin-development] [RFC] Proposal: Base58 encoded HD Wallet root key " Jean-Paul Kogelman
2014-03-12 13:11 ` Pavol Rusnak
2014-03-12 15:45 ` Jean-Paul Kogelman
2014-03-12 15:55 ` Pavol Rusnak
2014-03-12 16:49 ` Gary Rowe
2014-03-12 18:00 ` William Yager
2014-03-12 19:35 ` Jean-Paul Kogelman
2014-03-12 19:41 ` Gary Rowe
2014-03-12 19:26 ` Jean-Paul Kogelman
2014-03-12 19:39 ` Pavol Rusnak
2014-03-12 19:55 ` William Yager
2014-03-12 20:04 ` Pavol Rusnak
2014-03-12 20:10 ` William Yager
2014-03-12 20:24 ` Pavol Rusnak
2014-03-12 20:37 ` William Yager [this message]
2014-03-12 20:42 ` Pavol Rusnak
2014-03-12 20:49 ` William Yager
2014-03-12 21:08 ` Jean-Paul Kogelman
2014-03-12 21:15 ` William Yager
2014-04-22 0:05 William Yager
2014-04-24 19:39 ` William Yager
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