1997-02-13 - Re: anonymity and e-cash

Header Data

From: “Mark M.” <markm@voicenet.com>
To: cypherpunks@toad.com
Message Hash: aaa3d440daa1d90c5294cfcfa416f945be437b38713fa1cde23c62c289c66fdd
Message ID: <Pine.LNX.3.95.970212194144.3162A-100000@purple.voicenet.com>
Reply To: <m2zpx9lfrz.fsf@clouds.heaven.org>
UTC Datetime: 1997-02-13 00:42:39 UTC
Raw Date: Wed, 12 Feb 1997 16:42:39 -0800 (PST)

Raw message

From: "Mark M." <markm@voicenet.com>
Date: Wed, 12 Feb 1997 16:42:39 -0800 (PST)
To: cypherpunks@toad.com
Subject: Re: anonymity and e-cash
In-Reply-To: <m2zpx9lfrz.fsf@clouds.heaven.org>
Message-ID: <Pine.LNX.3.95.970212194144.3162A-100000@purple.voicenet.com>
MIME-Version: 1.0
Content-Type: text/plain


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On 12 Feb 1997 janke@unixg.ubc.ca wrote:

> It's not too hard: The payee forwards a blinded, non-signed coin
> to the payer. The payer has the bank sign this, and then returns
> it to the payee who strips out the blinding factor.

This is correct except for the fact that the payer also has to apply a blinding
factor to the coin, thus making it a "double-blinded" coin.  It gets signed by
the bank, the payer divides the coin by the blinding factor and sends it to
the payee, who then strips out his blinding factor.  Ecash coins can also be
laundered making the above scheme mostly unnecessary.  Since most people will
probably not look upon fully anonymous ecash highly, laundering will be a more
popular option as it cannot be prevented.


Mark
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