Optimistic Fair Exchange in a Multi-user Setting

  title={Optimistic Fair Exchange in a Multi-user Setting},
  author={Yevgeniy Dodis and Pil Joong Lee and Dae Hyun Yum},
  booktitle={IACR Cryptology ePrint Archive},
This paper addresses the security of optimistic fair exchange in a multi-user setting. While the security of public key encryption and public key signature schemes in a single-user setting guarantees the security in a multi-user setting, we show that the situation is different in the optimistic fair exchange. First, we show how to break, in the multi-user setting, an optimistic fair exchange scheme provably secure in the single-user setting. This example separates the security of optimistic… CONTINUE READING


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