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An Improved Off-line E-cash System with Controllable Anonymity

Ni Zhang, Pla Information

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Abstract

This paper presents an improved off-line Ecash system with controllable anonymity based on Jules′s trustee-based tracing mechanism,RSA blind signature and Schnorr digital signature algorithm.In our new E-cash system,the problems which TTP can masquerade users to spend user′s E-cash and anyone who somehow observes the E-cash coins can spend them are solved,so banks and users can benefit from the system.To enhance security of system,trustee token are signed by TTP with public digital signature algorithm.Finally,security of E-cash system are analyzed.

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What this paper is about

This paper presents an improved off-line Ecash system with controllable anonymity based on Jules′s trustee-based tracing mechanism,RSA blind signature and Schnorr digital signature algorithm.In our new E-cash system,the problems which TTP can masquerade users to spend user′s E-cash and anyone who somehow observes the E-cash coins can spend them are solved,so banks and users can benefit from the system.To enhance security of system,trustee token are signed by TTP with public digital signature algorithm.Finally,security of E-cash system are analyzed.

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Available abstract

This paper presents an improved off-line Ecash system with controllable anonymity based on Jules′s trustee-based tracing mechanism,RSA blind signature and Schnorr digital signature algorithm.In our new E-cash system,the problems which TTP can masquerade users to spend user′s E-cash and anyone who somehow observes the E-cash coins can spend them are solved,so banks and users can benefit from the system.To enhance security of system,trustee token are signed by TTP with public digital signature algorithm.Finally,security of E-cash system are analyzed.

Key concepts: Anonymity, Tracing, Electronic cash, Computer security, Digital signature, Cash, Blind signature, Security token

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