|
|
Fair electronic cash based on untrustworthy trustee |
Chen Xiaofeng; Wang Yumin |
National Key Laboratory on ISN Xidian University Xi an 710071 China |
|
|
Abstract A fair electronic cash protocol based on trustee is presented by using RSA blind signature technique in this paper, the identity of multi-spender will be revealed by trustee with very high probability. Contrasting with the previous protocol, the user’s money cannot be withdrawn unless the trustee is in collusion with the bank, and the trustee can only trace the money that the bank asked him to trace. So the privacy of the user can be ensured to the maximum limit. Also this protocol can be used to trace the dubious cash and the owner, thereby it may be exploited to decrease the crimes like money laundering, blackmailing, etc. in the electronic cash system. This protocol requires off-line participation of trustee when users withdraw the cash, so it is efficient for implementation.
|
Received: 30 March 2001
|
|
|
|
|
|
|
|