Anonymous Atomic Transactions


We show here an example of a protocol that satisfies anonymity properties while providing strong ACID (atomic, consistent, isolated, durable) transactional properties, resolving an open question. This allows us to provide electronic commerce protocols that are robust even in the event of message loss and communication failures. We use blind signature tokens to control values. We use a separate transaction log to reduce trust assumptions between the merchant,the consumer, and the bank. 1 Introduction Consumer privacy is an important goal of electronic payment systems. Some researchers have approached this question by adopting a token-based model. These tokens are meant to act as a type of currency: they can be used to purchase a good, but like coins, they do not reveal the identity of the holder. These systems offer privacy in making a purchase. Some typical examples of tokenbased electronic payment protocols ("digital cash" protocols) are [2, 3, 7, 5, 15]. These protocols provide cons..

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