Titlebook: Exploring New Frontiers of Theoretical Informatics; IFIP 18th World Comp Jean-Jacques Levy,Ernst W. Mayr,John C. Mitchell Conference procee

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Educational Activities in the Society,g encryption and key generation processes. After some simple but rather cumbersome substitutions, we should obtain two new systems .. and ... .. has 16 very dense equations of degree up to 255 in each of its 16 variables. With a single pair (.), with . a cleartext and . its encryption, its roots giv

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Purabi Mukherji,Atri Mukhopadhyayty for all applications. In this paper, we present a scheme which removes the key escrow from the IBE system proposed by Bonch and Franklin, while at the same time maintaining some important properties of the IBE. We also present some cryptosystems based on our variant including a signature scheme a

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https://doi.org/10.1007/3-540-34888-3block cyphers. In 1980, Toffoli showed how to realize a Boolean function by a reversible circuit, however the resulting complexity of such circuits has remained an open problem. We investigate the reversible circuit complexity of families of Boolean functions and derive conditions that characterize

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https://doi.org/10.1007/978-94-011-0978-9world, (non)uniform gap-definability, and relativized separations. This way, we settle certain open questions of Hemaspaandra, Ramachandran & Zimand [HRZ95 ] and Fenner, Fortnow & Kurtz [FFK94], extend results of Hemaspaandra, Jain & Vereshchagin [HJV93] and construct oracles achieving desired resul

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Kazuhiko Yago,Yoshio Asai,Masanao Itoheneral. A synchronous and an asynchronous version of the problem are considered. In the latter case the generals may start their activities at different times. In the synchronous case there are optimumtime solutions. Very simple and elegant techniques for constructing one of them are the main contri

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Ivor Grattan-Guinness,B. S. Yadavsence of a single link failure: if the shortest path is not affected by the failed link, then the message will be delivered through that path; otherwise, the system will guarantee that, when the message reaches the node where the failure has occurred, the message will then be rerouted through the sh