[6592] in cryptography@c2.net mail archive
Re: paycash: blind signature etc.
daemon@ATHENA.MIT.EDU (Adam Shostack)
Fri Feb 11 11:32:01 2000
Date: Wed, 9 Feb 2000 00:34:43 -0500
From: Adam Shostack <adam@homeport.org>
To: "R. A. Hettinga" <rah@shipwright.com>
Cc: Digital Bearer Settlement List <dbs@philodox.com>, cryptography@c2.net
Message-ID: <20000209003442.A2844@weathership.homeport.org>
Mime-Version: 1.0
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In-Reply-To: <v04220801b4bd18334f1d@[204.167.101.20]>
So the main document I've found (blsig.doc) is doubly obfuscated, once
in Russian, and once in Word's .doc format. .Doc is clearly the more
annoying of these. Are there other docs in English?
Anyway, has anyone taken a look at what the system offers? It looks
to us like its covered by Chaum's blinding patent. They even call the
functions in schemas 1 & 2 "B" and "U", apparently for blinding and
unblinding.
Adam
On Tue, Feb 01, 2000 at 06:13:57PM -0500, R. A. Hettinga wrote:
| Thanks much to Victor Dostov and Ivan Kouznetsov for their short but very
| insightful discussion at DCSB of the paycash system.
|
| At my request, Victor has provided me with more information on the paycash
| transaction system, and the blinding that it does in the course of moving
| money around.
|
| It is forwarded below.
|
| Cheers,
| Robert Hettinga,
| Moderator,
| The Digital Commerce Society of Boston
|
|
| --- begin forwarded text
|
|
| Reply-To: "Victor Dostov" <vd@mailbox.alkor.ru>
| From: "Victor Dostov" <vd@mailbox.alkor.ru>
| To: <rah@ibuc.com>
| Subject: paycash: blind signature etc.
| Date: Tue, 1 Feb 2000 01:10:32 +0300
|
| A more detailed description of the Paycash Internet payment system with some
| math is presented in the paper (13297 bt, zip-archive of rtf-document) at
| ftp://demo.paycash.ru/paycash.zip
|
| For our blind signature over RSA you can see at
| ftp://demo.paycash.ru/blsig.zip
|
|
| Also we obtained an independent experts' decision on the schemes of blind
| digital signature used in PayCash payment system. The examination was done
| for the purpose of algorithms used in the system verification, as well as
| patentability judgment. To accomplish such an expertise Bruce Schneier* the
| President of Counterpane Systems Company was invited. The basic topics of
| experts' decision are listed below. The whole text (zip-archive in
| Postscript format, 27 283 bites) is available here:
|
| ftp://demo.paycash.ru/schneier.zip
|
|
| More data is available at
|
| http://www.paycash.ru/new/english/
|
| Best regards and thanks again
|
| VIctor
|
| --- end forwarded text
|
|
| -----------------
| R. A. Hettinga <mailto: rah@ibuc.com>
| The Internet Bearer Underwriting Corporation <http://www.ibuc.com/>
| 44 Farquhar Street, Boston, MA 02131 USA
| "... however it may deserve respect for its usefulness and antiquity,
| [predicting the end of the world] has not been found agreeable to
| experience." -- Edward Gibbon, 'Decline and Fall of the Roman Empire'
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