Improvement of Efficiency in (Unconditional) Anonymous Transferable E-Cash

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Abstract

The practical advantage expected from transferable e-cash compare to non-transferable is the significant reduction of the interaction number between the bank and the users. However, this property is not fulfilled by anonymous transferable e-cash schemes of the state-of-the art. In this paper, we first present a transferable e-cash scheme with a reduced number of communications between the bank and the users that fulfils the computational anonymity property. Next, we present a transferable e-cash scheme with a reduced interaction number that fulfils the unconditional anonymity. This latter scheme is quite less efficient.

This work has been partially financially supported by the European Commission through the IST Program under Contract IST-2002-507932 ECRYPT.