[42115] in Cypherpunks
Re: Hack DigiCash: Payee Anonymity
daemon@ATHENA.MIT.EDU (David R. Conrad)
Tue Oct 24 07:31:25 1995
Date: Tue, 24 Oct 1995 07:22:13 -0400 (EDT)
From: "David R. Conrad" <drc@russell.moore.com>
Reply-To: conrad@grfn.org
To: cypherpunks@toad.com
In-Reply-To: <199510240750.IAA04175@utopia.hacktic.nl>
On Tue, 24 Oct 1995, Name Withheld by Request wrote:
> The <--(blinding)--- payer <--(blinding)--- payee
> Bank --(unblinding)-> payer --(unblinding)-> payee --> payee spends money
>
> The payee generates some digital coins, blinds them, and sends them to the
> payer. The payer then makes a withdrawl from his bank account, blinds the
> coins again (or not, it really doesn't matter) and sends them to the bank.
If the payer doesn't add a blinding factor, then the only blinding factor
is the one known to the payee. The payee could reveal this blinding factor
to the bank, destroying the payer's anonymity.
Right?
> The bank signs them, and returns them to the payer. The payer removes his
> blinding (if any) and sends them to the payee. The payee unblinds the
> coins and spends them at his leisure. Privacy for all involved.
David R. Conrad, conrad@detroit.freenet.org, http://www.grfn.org/~conrad
Hardware & Software Committee -- Finger conrad@grfn.org for public key
Key fingerprint = 33 12 BC 77 48 81 99 A5 D8 9C 43 16 3C 37 0B 50
No, his mind is not for rent to any god or government.
