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Eric Ruppert

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Linearizability Is Not Always a Safety Property

Rachid Guerraoui, Eric Ruppert

We show that, in contrast to the general belief in the distributed computing community, linearizability, the celebrated consistency property, is not always a safety property. More specifically, we give an object for which it is possible to have an infinite ...

Springer International Publishing2014

A paradox of eventual linearizability in shared memory

Rachid Guerraoui, Eric Ruppert

This paper compares, for the rst time, the computational power of linearizable objects with that of eventually linearizable ones. We present the following paradox. We show that, unsurprisingly, no set of eventually linearizable objects can (1) implement an ...

ACM Press2014

Byzantine Agreement with Homonyms

Rachid Guerraoui, Anne-Marie Kermarrec, Eric Ruppert

So far, the distributed computing community has either assumed that all the processes of a distributed system have distinct identifiers or, more rarely, that the processes are anonymous and have no identifiers. These are two extremes of the same general mo ...

Springer2013

Byzantine agreement with homonyms

Rachid Guerraoui, Anne-Marie Kermarrec, Eric Ruppert

ACM Press2011

Names Trump Malice: Tiny Mobile Agents Can Tolerate Byzantine Failures

Rachid Guerraoui, Eric Ruppert

We introduce a new theoretical model of ad hoc mobile computing in which agents have severely restricted memory, highly unpredictable movement and no initial knowledge of the system. Each agent’s memory can store O(1) bits, plus a unique identiﬁer, and O(1 ...

2009

Anonymous and Fault-Tolerant Shared-Memory Computing

Rachid Guerraoui, Eric Ruppert

The vast majority of papers on distributed computing assume that processes are assigned unique identifiers before computation begins. But is this assumption necessary? What if processes do not have unique identifiers or do not wish to divulge them for re ...

2007

Anonymous and fault-tolerant shared-memory computing

Rachid Guerraoui, Eric Ruppert

Springer, Springer-Verlag2007

Even Small Birds are Unique: Population Protocols with Identifiers

Rachid Guerraoui, Eric Ruppert

Although much research has been devoted to designing and experimenting on ad hoc networks of tiny devices, very little has focussed on devising theoretical models to capture the inherent power and limitations of such networks. A notable exception is the po ...

2007

Secretive Birds: Privacy in Population Protocols

Rachid Guerraoui, Eric Ruppert

We study private computations in a system of tiny mobile agents. We consider the mobile population protocol model of Angluin et al. [2] and ask what can be computed without ever revealing any input to a curious adversary. We show that any computable predic ...

2007

When Birds Die: Making Population Protocols Fault-tolerant

Rachid Guerraoui, Eric Ruppert

In the population protocol model introduced by Angluin et al. [2], a collection of agents, which are modelled by finite state machines, move around unpredictably and have pairwise interactions. The ability of such systems to compute functions on a multiset ...

2006