最近，Baseri 等人 提出了一種安全的，不可追踪的離線電子現金系統。他們聲稱，他們的計劃可以實現電子現金系統的安全要求，如不可追踪性，匿名性，不可連接性，雙重花費檢查，不可偽造性，日期附加性和防止偽造硬幣。他們進一步證明了通過使用解離散對數問題的難度而達到不可偽造性的安全特徵。然而，在密碼分析後，我們發現該方案不能滿足不可追踪性的安全要求。因此，我們修改該方法以期達到具有這項功能，這在電子現金系統中是相當重要的。 Recently, Baseri et al. proposed a secure, untraceable off-line electronic cash system. They claimed that their scheme could achieve the security requirements of an e-cash system, such as untraceability, anonymity, unlinkability, double-spending checking, unforgeability, date-attachability, and preventing forging coins. They further proved the unforgeability security feature by using the hardness of discrete logarithm problem. However, after cryptanalysis, we determined that the scheme could not satisfy the untraceability security feature requirement. Therefore, we modified the method to include this desired functionality, which is considerably important in an e-cash system.
