public inbox for bitcoindev@googlegroups.com
 help / color / mirror / Atom feed
From: Gavin Andresen <gavinandresen@gmail.com>
To: Pieter Wuille <pieter.wuille@gmail.com>
Cc: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Time to worry about 80-bit collision attacks or not?
Date: Thu, 7 Jan 2016 20:00:42 -0500	[thread overview]
Message-ID: <CABsx9T1cPYorAo=u5YjA1tOoN5GNQpb_hT-ZTG9G9Hp88GgAMA@mail.gmail.com> (raw)
In-Reply-To: <CAPg+sBhH0MODjjp8Avx+Fy_UGqzMjUq_jn3vT3oH=u3711tsSA@mail.gmail.com>

[-- Attachment #1: Type: text/plain, Size: 1030 bytes --]

On Thu, Jan 7, 2016 at 6:52 PM, Pieter Wuille <pieter.wuille@gmail.com>
wrote:

> Bitcoin does have parts that rely on economic arguments for security or
> privacy, but can we please stick to using cryptography that is up to par
> for parts where we can? It's a small constant factor of data, and it
> categorically removes the worry about security levels.
>
Our message may have crossed in the mod queue:

"So can we quantify the incremental increase in security of SHA256(SHA256)
over RIPEMD160(SHA256) versus the incremental increase in security of
having a simpler implementation of segwitness?"

I believe the history of computer security is that implementation errors
and sidechannel attacks are much, much more common than brute-force breaks.
KEEP IT SIMPLE.

(and a quibble:  "do a 80-bit search for B and C such that H(A and B) = H(B
and C)"  isn't enough, you have to end up with a C public key for which you
know the corresponding private key or the attacker just succeeds in burning
the funds)


-- 
--
Gavin Andresen

[-- Attachment #2: Type: text/html, Size: 1761 bytes --]

  reply	other threads:[~2016-01-08  1:00 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-07 19:02 [bitcoin-dev] Time to worry about 80-bit collision attacks or not? Gavin Andresen
2016-01-07 19:13 ` Matt Corallo
2016-01-07 19:19 ` Adam Back
2016-01-07 20:56   ` Dave Scotese
2016-01-07 21:06     ` Gavin Andresen
2016-01-07 22:56       ` Ethan Heilman
2016-01-07 23:39         ` Gavin Andresen
2016-01-08  1:26           ` Matt Corallo
2016-01-08  1:54             ` Gavin Andresen
2016-01-08 17:38               ` Pieter Wuille
2016-01-08 18:41               ` Peter Todd
2016-01-07 20:40 ` Ethan Heilman
2016-01-07 23:52 ` Pieter Wuille
2016-01-08  1:00   ` Gavin Andresen [this message]
2016-01-08  1:27     ` Watson Ladd
2016-01-08  3:30   ` Rusty Russell
2016-01-08  3:41     ` Matt Corallo
2016-01-08 12:02       ` Rusty Russell
2016-01-08 12:38         ` Gavin Andresen
2016-01-08 14:34           ` Watson Ladd
2016-01-08 15:26             ` Adam Back
2016-01-08 15:33           ` Anthony Towns
2016-01-08 15:46             ` Gavin Andresen
2016-01-08 15:50               ` Gavin Andresen
2016-01-08 15:59                 ` Gavin Andresen
2016-01-11 20:32                 ` Jorge Timón
2016-01-08 16:06               ` Gavin Andresen
2016-01-11  3:57               ` Rusty Russell
2016-01-11  6:57                 ` Peter Todd
2016-01-11 23:57               ` Tier Nolan
2016-01-12  0:00                 ` Tier Nolan
2016-01-12 12:08                   ` Gavin Andresen
2016-01-12 23:22                     ` Zooko Wilcox-O'Hearn
2016-01-08 18:52     ` Peter Todd

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CABsx9T1cPYorAo=u5YjA1tOoN5GNQpb_hT-ZTG9G9Hp88GgAMA@mail.gmail.com' \
    --to=gavinandresen@gmail.com \
    --cc=bitcoin-dev@lists.linuxfoundation.org \
    --cc=pieter.wuille@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox