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 15:49:43 -0500 [thread overview]
Message-ID: <CAG8oi1Mac8TozHaVQF_BWLFp_EdA_VF3aEs1aALhA3Wpvmfusw@mail.gmail.com> (raw)
In-Reply-To: <5320C6C7.9040602@gk2.sk>
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On Wed, Mar 12, 2014 at 3:42 PM, Pavol Rusnak <stick@gk2•sk> wrote:
> On 03/12/2014 09:37 PM, William Yager wrote:
> > (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.
>
> To give you some numbers: TREZOR (120MHz ARM) does 1024 rounds of
> PBKDF2-HMAC-SHA512 in around 1 second.
>
> So 2^16 is around one minute, 2^21 is around half an hour.
>
>
Precisely. And since the target of this BIP is generally storage wallets
(just like BIP 0038), we figured these were reasonable time scales for
encryption/decryption on slow devices.
Let's say you're implementing a Raspberry Pi based cold wallet printer.
Having the user wait 10 seconds to several minutes is not unreasonable for
a one-time activity, especially when at least this much time is used to
generate entropy, print the wallet, etc.
The same goes for phones. If you're importing a heavily encrypted wallet
into your device, the user won't mind waiting a few seconds or even a few
minutes.
Plus, as an added bonus, the amount of time it will take to encrypt/decrypt
is highly deterministic, so it's easy to add a nice progress bar to a UI.
Will
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next prev parent reply other threads:[~2014-03-12 20:49 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
2014-03-12 20:42 ` Pavol Rusnak
2014-03-12 20:49 ` William Yager [this message]
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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