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

Header Data

From: “Mark M.” <markm@voicenet.com>
To: cypherpunks@toad.com
Message Hash: 91c417d296d1318e4b9afe564de6c98a4a701d352cce4981dbe59d3964eeb0b0
Message ID: <199702130157.RAA13347@toad.com>
Reply To: N/A
UTC Datetime: 1997-02-13 01:57:20 UTC
Raw Date: Wed, 12 Feb 1997 17:57:20 -0800 (PST)

Raw message

From: "Mark M." <markm@voicenet.com>
Date: Wed, 12 Feb 1997 17:57:20 -0800 (PST)
To: cypherpunks@toad.com
Subject: Re: anonymity and e-cash
Message-ID: <199702130157.RAA13347@toad.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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