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Broadcast among n parties in the presence of t ges n/3 malicious parties is possible only with some additional setup. The most common setup considered is the existence of a PKI and secure, digital signatures, where so-called authenticated broadcast is achievable for any t < n. It is known that t + 1 rounds are necessary and sufficient for deterministic protocols achieving authenticated broadcast...
IBM's firewall products offer a new design and rationale for security architecture that ensures protection and secrecy of data traffic at the Internet protocol (IP) layer. The design can be broken down into three components: (1) a security policy for determining when, where and how security measures are to be applied; (2) a modular key management protocol (MKMP) which establishes shared secrets between...
In this paper we study the behavior of deterministic algorithms when consensus is needed repeatedly, say k times. We show that it is possible to achieve consensus with the optimal number of processors (n > 3t), and when k is large enough, with optimal amortized cost in all other measures: the number of communication rounds r*, the maximal message size m*, and the total bit complexity b*. More specifically,...
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