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Date attachable offline electronic cash scheme.

Chun-I Fan1, Wei-Zhe Sun1, Hoi-Tung Hau1

  • 1Department of Computer Science and Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.

Thescientificworldjournal
|July 2, 2014
PubMed
Summary

This study introduces a secure offline electronic cash (e-cash) system with date attachability. It ensures user privacy and simplifies bank database management through embedded expiration and deposit dates.

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Area of Science:

  • Computer Science
  • Cryptography
  • E-commerce Security

Background:

  • Electronic cash (e-cash) is crucial for secure online transactions, demanding both anonymity and accuracy.
  • Existing e-cash systems, online and offline, present distinct advantages and disadvantages.
  • Privacy and user rights are paramount in e-commerce, necessitating robust security measures.

Purpose of the Study:

  • To propose a novel, provably secure, and efficient offline e-cash scheme.
  • To introduce date attachability, embedding both expiration and deposit dates into e-cash.
  • To enhance database management for banks and ensure accurate interest calculation for users.

Main Methods:

  • Utilizing blind signature techniques for secure e-cash generation.
  • Developing an offline e-cash scheme with simultaneous embedding of expiration and deposit dates.
  • Conducting rigorous security analysis and formal proofs for key properties.

Main Results:

  • A provably secure and efficient offline e-cash scheme with date attachability.
  • Simultaneous embedding of expiration and deposit dates, preventing forgery.
  • Facilitation of easier database management for financial institutions.

Conclusions:

  • The proposed scheme effectively balances user anonymity with conditional traceability.
  • Date attachability enhances the practical utility of offline e-cash for both users and banks.
  • The system provides strong security guarantees, including unforgeability and no-swindling.