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Dining Cryptographers with 0.924 Verifiable Collision Resolution

Franck Ch.

Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica

2014

Vol. 14, no. 1

49--60

The dining cryptographers protocol implements a multiple access channel in which senders and recipients are anonymous. A problem is that a malicious participant can disrupt communication by deliberately creating collisions. We propose a computationally secure dining cryptographers protocol with collision resolution that achieves a maximum stable throughput of 0.924 messages per round and which allows to easily detect disruptors.

Multi-scale analysis of water alteration on the rockslope stability framework

Dochez S., Laouafa F., Franck Ch., Guedon S., Martineau F., d'Amato J., Saintenoy A.

Acta Geophysica

2014

Vol. 62, no. 5

1025--1048

Water is an important weathering factor on rock discontinuities and in rock mass mechanical behaviour because of its chemical features such as temperature, pH or salinity which make it a “good” candidate to rock degradation. Furthermore the increase of rainfall frequency or intensity highlights some problems on the rock slope stability analysis. This study aims to evaluate the effect of water flow on the rock slope stability and it is performed at two space scales: in situ scale and laboratory (micro scale and macro scale). It shows how water induces degradation at multi-scale (surface roughness and matrix) and thus may decrease the stability of the discontinuous rock mass. It has two main components: the effect of water-solid chemical mechanisms and the analysis of the mechanical response of the discontinuity modified by the water alteration.