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Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] New standard transaction types: time to
 schedule a blockchain split?
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On Wed, Aug 24, 2011 at 3:05 PM, Christian Decker
<decker.christian@gmail.com> wrote:
> we could add an rsa-like scheme which allows m-out-of-n signatures. It works
> by distributing shares of the key which are points on a curve having the
> actual key as 0-value. It does not require special length for the key so if
> ecdsa allows something similar there need not be anything changed.

This works fine for ECC.  But it requires that the composite key
signer has simultaneous access to all the key-parts, so it doesn't
solve the "my PC has malware" problem.