Sorry about the forward, but you'll see why in a sec... Cheers, Bob --- begin forwarded text Date: Tue, 7 Nov 1995 15:22:34 -0500 To: bsdc@ai.mit.edu Subject: [joanne@theory.lcs.mit.edu: CIS TALK THIS THURSDAY, Nov 9th 4 p.m. in 518] Sender: bounce-bsdc@ai.mit.edu Precedence: bulk From: joanne@theory.lcs.mit.edu (Joanne Talbot) Date: Tue, 07 Nov 95 11:57:15 EST To: theory-seminars@theory.lcs.mit.edu Reply-To: theory-seminars-request@theory.lcs.mit.edu Subject: CIS TALK THIS THURSDAY, Nov 9th 4 p.m. in 518 **Seminar of interest!! CIS Seminar: Thursday, Nov. 9th Place: NE43-518 Refreshments: 4:00 p.m. Talk: 4:15 p.m. Title: Electronic Cash Author: Stefan Brands from CWI Abstract: Two approaches for electronic payments prevail; one focusses on the secure transmission of creditcard numbers and is account-based, while the other is token-based and tries to mimic the way coins or cheques are traded. The first approach can be realized using elementary cryptographic techniques, but offers at best anonymity of payments against merchants and requires on-line payment verification. On-line payment verification can be expensive and become the bottleneck of a large-scale implementation. The second approach, electronic cash, can offer full anonimity of payments, but requires fairly complex cryptographic techniques in order to guarantee security. Pioneering work in this area has been done by David Chaum. Unfortunately, his techniques are practical only for on-line electronic payments and hence less appropriate for large-scale implementation. In my presentation I will discuss the design of practical electronic cash systems that have off-line payment ability. Further information can be found on: http://www.cwi.nl/~brands/ Host: Ronald Rivest --- end forwarded text ----------------- Robert Hettinga (rah@shipwright.com) Shipwright Development Corporation, 44 Farquhar Street, Boston, MA 02131 USA (617) 323-7923 "Reality is not optional." --Thomas Sowell
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