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In the electronic commerce context, it is common that a customer wishes to buy a pack of products/services composed of several products/services from different merchants. The customer is interested in buying all products from the pack or no product at all. On the other hand, sometimes the customer wants to buy exactly one product from many merchants, and for this, he specifies in his request more possible products according to his preferences but from these options only one will be committed. The combination in any form of these two types of e-commerce transactions will be named complex transaction. Despite the great variety of multi-party fair exchange protocols proposed until now, there is no solution to address to physical products delivery in complex transactions. In this paper, we propose the first e-commerce protocol for physical products delivery in complex transactions that provides fair exchange and anonymity of the customer.

Preserving Anonymity in Fair Exchange Complex Transactions E-Commerce Protocol for B2C/B2B Applications