Download Composition of Secure Multi-Party Protocols: A Comprehensive by Yehuda Lindell PDF

By Yehuda Lindell

In the environment of multi-party computation, units of 2 or extra events with inner most inputs desire to together compute a few (predetermined) functionality in their inputs. common effects bearing on safe two-party or multi-party computation have been first introduced within the Eighties. positioned in brief, those effects assert that lower than definite assumptions one could build protocols for securely computing any wanted multi-party performance. notwithstanding, this examine relates merely to a environment the place a unmarried protocol execution is performed. by contrast, in smooth networks, many various protocol executions are run on the comparable time.

This ebook is dedicated to the final and systematic research of safe multi-party computation below composition. regardless of its emphasis on a theoretically well-founded remedy of the topic, basic recommendations for designing safe protocols are built which can even bring about schemes or modules to be included in sensible platforms. The ebook clarifies basic matters concerning defense in a multi-execution atmosphere and offers a finished and precise therapy of the composition of safe multi-party protocols.

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Extra resources for Composition of Secure Multi-Party Protocols: A Comprehensive Study

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Introduction protocol is called universally composable. ) The importance of this new definition is due to a composition theorem that states that any universally composable protocol remains secure under concurrent general composition with arbitrary sets of parties [c01]. Therefore, universal composability provides the security guarantees needed for running protocols in modern network settings. As such, it is a very important contribution to the theory of secure computation and protocol composition.

3 for more details. Thus, when trusted setup can be assumed, it is possible to obtain concurrent general composition for arbitrary sets of parties, as desired. On the negative side, wide-reaching impossibility results have been shown for the case where no honest majority is present and when no trusted setup phase is assumed [ckl03]. In particular, for deterministic two-party functions where both parties receive the same output, UC secure protocols can only be achieved if the function depends on only one party’s input and is efficiently invertible (in some sense, this is just bit transmission).

The only difference between our definition and previous ones is as follows. Recall that when output delivery is not guaranteed, the adversary is allowed to disrupt the computation and have the honest parties “abort”, rather than receive their prescribed output. Previously, it was required that if one honest party aborted then all other honest parties also abort. Thus, the parties agree on whether or not the protocol execution terminated successfully or not. In our new definition, it is possible that some honest parties abort while others receive their correct output.

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