public inbox for bitcoindev@googlegroups.com
 help / color / mirror / Atom feed
From: Lloyd Fournier <lloyd.fourn@gmail.com>
To: Erik Aronesty <erik@q32.com>,
	 Bitcoin Protocol Discussion
	<bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Schnorr sigs vs pairing sigs
Date: Fri, 6 Mar 2020 17:40:24 +1100	[thread overview]
Message-ID: <CAH5Bsr3CbG6b4tk0hkLECfg0LM38BNp7nfspLv+NbMg6f79iDg@mail.gmail.com> (raw)
In-Reply-To: <CAJowKg+Sgfv-FxZ2gyYWO4HmVwVFZjpjN3RkGN4y1TJwpuLMtQ@mail.gmail.com>

[-- Attachment #1: Type: text/plain, Size: 1262 bytes --]

Hi Erik,

There are a strong arguments for and against pairing based sigs in Bitcoin.
One very strong argument in favour over non-deterministic signatures like
Schnorr over BLS is it enables a kind of signature encryption called
"adaptor signatures". This construction is key to many exciting up and
coming layer 2 protocols and isn't possible unless the signature scheme
uses randomness.

self plug: I have a paper on this topic called "One-Time Verifiably
Encrypted Signatures A.K.A Adaptor Signatures"
 https://github.com/LLFourn/one-time-VES/blob/master/main.pdf

LL


On Fri, Mar 6, 2020 at 6:03 AM Erik Aronesty via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> Schnorr sigs rely so heavily on the masking provided by a random
> nonce.   There are so many easy ways to introduce bias (hash + modulo,
> for example).
>
> Even 2 bits of bias can result in serious attacks:
>
> https://ecc2017.cs.ru.nl/slides/ecc2017-tibouchi.pdf
>
> Maybe pairing based sigs  - which are slower - might be both more
> flexible, and better suited to secure implemetnations?
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>

[-- Attachment #2: Type: text/html, Size: 2076 bytes --]

      reply	other threads:[~2020-03-06  6:40 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-05 19:01 [bitcoin-dev] Schnorr sigs vs pairing sigs Erik Aronesty
2020-03-06  6:40 ` Lloyd Fournier [this message]

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=CAH5Bsr3CbG6b4tk0hkLECfg0LM38BNp7nfspLv+NbMg6f79iDg@mail.gmail.com \
    --to=lloyd.fourn@gmail.com \
    --cc=bitcoin-dev@lists.linuxfoundation.org \
    --cc=erik@q32.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