Concept

Multi-party fair exchange protocol

Summary
In cryptography, a multi-party fair exchange protocol is protocol where parties accept to deliver an item if and only if they receive an item in return. Definition Matthew K. Franklin and Gene Tsudik suggested in 1998 the following classification:
  • An n-party single-unit general exchange is a permutation \sigma on {1...n}, where each party P_i offers a single unit of commodity K_i to P_{\sigma(i)}, and receives a single unit of commodity K_{\sigma^{-1}(i)} from P_{\sigma^{-1}(i)}.
  • An n-party multi-unit general exchange is a matrix of baskets, where the entry B_{ij} in row i and column j is the basket of goods given by P_i to P_j.
See also Secure multi-party computation
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