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        Double-Blind Compact E-cash from Bilinear Map

        Jiyang Chen,Bin Lian,Yongjie Li,Jialin Cui,Ping Yu,Zhenyu Shu,Jili Tao 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.4

        Compact E-cash is the first scheme which can withdraw 2l coins within (1) operations and then store them in ( ) bits. Because of its high efficiency, a lot of research has been carried out on its basis, but no previous research pay attention to the privacy of payees and in some cases, payees have the same privacy requirement as payers. We propose a double-blind compact E-cash scheme, which means that both the payer and the payee can keep anonymous while spending. In our scheme, the payer and the bank cannot determine whether the payees of two different transactions are the same one and connect the payee with transactions related to him, in this way, the privacy of the payee is protected. And our protocols disconnect the received coin from previous transaction, then, the coin can be transferred into an unspent coin which belongs to the payee. The proposed e-cash scheme is secure within y-DDHI and LRSW assumption.

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