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authorJochen Hoenicke <hoenicke@gmail.com>2016-07-27 10:39:36 +0000
committerbitcoindev <bitcoindev@gnusha.org>2016-07-27 10:39:48 +0000
commit8db2d4744ce29d14c61e5f3508bcd60d2d41cbae (patch)
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parent13e3cae085dccd524f49e5a3056ad58370c0fc59 (diff)
downloadpi-bitcoindev-8db2d4744ce29d14c61e5f3508bcd60d2d41cbae.tar.gz
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Re: [bitcoin-dev] BIP proposal: derived mnemonics
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+References: <5797AC88.8030507@gmail.com> <5797C3A7.5030600@jonasschnelli.ch>
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+From: Jochen Hoenicke <hoenicke@gmail.com>
+Date: Wed, 27 Jul 2016 10:39:36 +0000
+Message-ID: <CANYHNmLot1+-LbisfrPRtgDPnofD7bnQ3By_pgT2RFvLHRm7Hg@mail.gmail.com>
+To: Jonas Schnelli <dev@jonasschnelli.ch>,
+ Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
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+Subject: Re: [bitcoin-dev] BIP proposal: derived mnemonics
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+Jonas Schnelli via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org>
+schrieb am Di., 26. Juli 2016 um 22:10 Uhr:
+
+> Side-note: Bip39 does still use PBKDF2 with 2048 iterations which I
+> personally consider "not enough" to protect a serious amount of funds.
+>
+>
+But what are the alternatives? Put an expensive processor and a decent
+amount of memory in every hardware wallet to support scrypt? Use a million
+iterations and just wait 10 minutes after entering you passphrase? Or
+compute the secret key on your online computer instead?
+
+Also, how many iterations are secure? A million? Then just add two random
+lower-case letters to the end of your passphrase and you have a better
+protection with 2048 iterations. If you want to be able to use your
+passphrase with cheap hardware and be protected against a high-end computer
+with multiple GPUs that is almost a mllion times faster, then you have to
+choose a good passphrase. Or just make sure nobody steals your seed; it is
+not a brainwallet that is only protected by the passphrase after all.
+
+Regards,
+ Jochen
+
+--047d7ba97076ce52c405389ba272
+Content-Type: text/html; charset=UTF-8
+Content-Transfer-Encoding: quoted-printable
+
+<div dir=3D"ltr"><div class=3D"gmail_quote"><div dir=3D"ltr">Jonas Schnelli=
+ via bitcoin-dev &lt;<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.or=
+g">bitcoin-dev@lists.linuxfoundation.org</a>&gt; schrieb am Di., 26. Juli 2=
+016 um 22:10=C2=A0Uhr:<br></div><blockquote class=3D"gmail_quote" style=3D"=
+margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Side-note: B=
+ip39 does still use PBKDF2 with 2048 iterations which I<br>
+personally consider &quot;not enough&quot; to protect a serious amount of f=
+unds.<br><br></blockquote><div><br></div><div><span style=3D"line-height:1.=
+5">But what are the alternatives?=C2=A0 Put an expensive processor and a de=
+cent amount of memory in every hardware wallet to support scrypt?=C2=A0 Use=
+ a million iterations and just wait 10 minutes after entering you passphras=
+e?=C2=A0 Or compute the secret key on your online computer instead?</span><=
+br></div><div><br></div><div><div>Also, how many iterations are secure?=C2=
+=A0 A million?=C2=A0 Then just add two random lower-case letters to the end=
+ of your passphrase and you have a better protection with 2048 iterations.=
+=C2=A0<span style=3D"line-height:1.5">If you want to be able to use your pa=
+ssphrase with cheap hardware and be protected against a high-end computer w=
+ith multiple GPUs that is almost a mllion times faster, then you have to ch=
+oose a good passphrase.=C2=A0 Or just make sure nobody steals your seed; it=
+ is not a brainwallet that is only protected by the passphrase after all.</=
+span></div></div><div><br></div><div>Regards,</div><div>=C2=A0 Jochen</div>=
+<div><br></div></div></div>
+
+--047d7ba97076ce52c405389ba272--
+
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