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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.
Matthew K. Franklin and Gene Tsudik suggested in 1998 the following classification:
An -party single-unit general exchange is a permutation on , where each party offers a single unit of commodity to , and receives a single unit of commodity from .
An -party multi-unit general exchange is a matrix of baskets, where the entry in row and column is the basket of goods given by to .
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