[bitcoin-dev] Multiparty signatures

[Russell O'Connor]

On Thu, Jul 19, 2018 at 8:16 AM, Erik Aronesty via bitcoin-dev <
bitcoin-dev at lists.linuxfoundation.org> wrote:

>  you can't birthday attack something where there's only a single variable
> that you can modify.
>

When engaging in a multiparty signature, the attacker can more than one
variable to modify.  When you are party to a multi-party signature (for
example, in some sort of coin-join protocol) it could be that every other
participant in the multi-party signature is, in fact, the same single
attacker representing themselves as multiple participants.  This is how the
attacker gets their hands on multiple variables.
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