Synchronous and Asynchronous Network Sample Clauses

Synchronous and Asynchronous Network. An exten- sive literature has studied Byzantine agreement in different network models. In a synchronous network, there is a priori known upper-bound λ of the network delay, while an asyn- chronous network does not have. For convenience, we call the BA protocols designed for the former model the synchronous BA and the BA protocols designed for the latter model the asynchronous BA. When applying to the blockchain, asynchronous BAs usu- ally outperform synchronous BAs from two aspects. First, asynchronous BA has better resistance to network failures. Although the network nowadays is highly reliable, network failures happen from time to time. For example, the undersea cables break or the network services shut down for updating. In these cases, the network delay may be much longer than the typical case and the security of a synchronous BA is not guaranteed. Second, the performance of the synchronous protocols is limited by the upper-bound λ. On the other hand, there is no upper-bound for the network delay in the asynchronous protocols, so the protocols proceed when enough messages are delivered, which only depends on the actual network delay. However, the nature that the asynchronous protocols do not depend on any pre-determined time bound makes it impossible to achieve strongly fair validity2. In this paper, we show the following impossibility result.
Sample 1
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