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Contents

• Prolog
• Introduction
• About Money
  • The History Of Money
  • Disadvantages of barter
  • Advantages Of A Money Economy
  • Money Standard
  • Electronic money
  • Confidence, A Key Element
• Introduction to Cryptography
  • Encryption Systems
  • Introduction to Number Theory
    • Congruences
    • The Greatest Common Divisor
    • Powers modulo a prime
    • Primitive roots
  • Encryption based on powers and congruences
    • The Diffie-Hellman key exchange procedure
    • The Rivest-Shamir-Adleman public key system
    • A public key system as hard as factoring
  • Product Ciphers
    • DES
  • Message Digest and Digital Signatures
  • Methods Of Attack
    • Differential Cryptanalysis
• Key Elements of a Digital Cash System
  • Mandatory Properties
    • Security
    • User-friendly
    • Portable
    • Two-way and Transferability
  • Desired Elements
    • Off-line Capable
    • Divisible
    • Infinite Duration
    • Wide Acceptability
    • No Secret Algorithm
  • Optional Properties
    • Anonymity
    • Unit-of-value Freedom
• Implementations of E-Money Systems
  • Introduction
  • Ecash
  • CyberCash
  • NetBill
  • First Virtual
  • Mondex
• Advantages of Digital Money
  • For Users
  • For Banks
  • For the Issuer
  • For the Retailers
• Disadvantages of Digital Money
  • Global Disadvantages
  • For Users
  • Legal problems
• Conclusion
• Acknowledgements
• References
• About this document ...