,A Divisible E-cash System Using Secret Sharing

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Divisibility of an e-cash is an impor-tant requirement for a practical e-cash system but hasno practical solution up to now.In this paper,a divis-ible e-cash system for some special applications is pro-posed using the secret sharing scheme.A verifiable se-cret sharing scheme based on the intractable discretelogarithm problem is put forward as the building blockin constructing the e-cash system.The e-cash systemis smart-card oriented and the card is denoted as thehonest dealer to divide the coin in the payment proto-col.The security of the divisible e-cash system can bederived directly from the security of the well-knownSchnorr identification and signature schemes and thesecurity of intractable discrete logarithm problem.
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