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authorThomas Voegtlin <thomasv1@gmx.de>2014-01-24 17:47:21 +0100
committerbitcoindev <bitcoindev@gnusha.org>2014-01-24 16:47:29 +0000
commitc59f961b91c26924438ad8aed06d8b8264237843 (patch)
tree1a7df03f596a0af1d17e2fde2cd83da654af4267
parent5f43e5f15aaf222257ec937e1f0dd4178b678adf (diff)
downloadpi-bitcoindev-c59f961b91c26924438ad8aed06d8b8264237843.tar.gz
pi-bitcoindev-c59f961b91c26924438ad8aed06d8b8264237843.zip
Re: [Bitcoin-development] BIP0039: Final call
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+Subject: Re: [Bitcoin-development] BIP0039: Final call
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+
+Le 24/01/2014 10:05, Peter Todd a �crit :
+> On Tue, Jan 21, 2014 at 01:00:43AM +0100, Thomas Voegtlin wrote:
+>> Hi slush,
+>>
+>> Thank you for your new proposal; it seems to be a compromise.
+>>
+>> @Christophe Biocca:
+>> If the wordlist becomes part of the standard, then we will run into
+>> problems of collisions once users ask for wordlists in every language.
+>>
+>> IMO the right approach is to implement checksums that do not depend
+>> on the wordlist (eg the 'brute force' method, Hash(mnemonic||1) mod
+>> 2^k == 0 )
+>> this would also allow us to implement sipa's variable stretching proposal.
+>>
+>> I understand this is not possible because of the computational
+>> requirements of devices such as trezor.
+> Is it? Surely the trezor can bruteforce, say, 8 bits == 0. How many
+> SHA256/sec can the trezor hardware do? Generating your seed is a
+> one-time thing after all - that taking 10-30s doesn't seem like a big
+> deal to me.
+>
+> Even a 1/256th "checksum" will really cut down on the number of mistakes
+> made and money lost.
+
+slush, correct me if I'm wrong, but I don't think that's the only reason:
+They want to generate a seed by combining entropy from the trezor device
+and from the user's computer;
+In addition, they want the computer to be able to check that the seed
+actually was derived from the entropy it provided, using only a master
+public key (the computer does not have access to the seed)
+
+This is why they designed bip39 that way.
+
+I think the new bip39 proposal could be used in Electrum as an option
+for trezor, but I am reluctant to make it default, because it imposes
+its own dictionary.
+
+
+