Lecture 7
Lecture 7 Introduction to Electronic Commerce
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Electronic Commerce: Now and the Future
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Outline
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Money
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Properties of Money/Cash
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More Properties of Money
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More Properties of Money
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Features of Electronic Payment Protocols
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Features of Electronic Payment Protocols
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Classification of Some Real Schemes
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Credit-card payment protocol: Attempt #1
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Credit-card payment protocol: Attempt #2
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Credit-card payment protocol: iKP (i = 1, 2, or 3)
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iKP Setup
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1KP
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1KP Notes
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2KP
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2KP Notes
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3KP
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SET
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More on SET
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Certificate Authorities
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FirstVirtual
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FirstVirtual
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NetBill
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NetBill Features
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Digital Cash
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Token-Based Approach: DigiCash
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Problems with DigiCash
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DigiCash : Attempt #1
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Attempt #2: Anonymity
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Attempt #3: Fix Dollar Amount
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Attempt # 4: No Double Spending
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Still some problems
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Attempt # 5: Identification of Cheater
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Attempt # 5, cont'd
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How to Detect the Identity of the Cheater
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Putting it all together
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Check Properties
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Brand's Protocol: Background math
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More Background
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The Setup: User and Bank Do This First
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The Coin (must make it anonymous)
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Payment Protocol
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Catching Double Spending: Just math
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Divisibility
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Using the Tree
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Millicent ( Manasse of SRC)
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Millicent Model
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Scrip Properties
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Real Life
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Next lecture
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Heather L. Marko
Last Modified: October 1998