Khalid Alhamed

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Currently many users trust binaries downloaded from repositories such as sourceforge.net. As with any system connected to the Internet, such repositories can be subject to attacks tampering with the distributed binaries (inserting viruses, changing behavior). We propose a mechanism to reduce the level of trust that users are required to have into(More)
The discussed "Stacking the Deck" attack and our solution are relevant only to software controlled by loosely constituted communities. Developers can change their vision and abandon features that are essential for certain users. Moreover, well funded attackers can effectively take control of a project by orchestrating the transfer of the leadership of the(More)
DirectDemocracyP2P5 is an open source platform developed in JAVA and offering peer-to-peer and mobile ad hoc wireless communication capabilities. The platform offers an API supporting plugins, beside its main application: deliberative petition drives (aka citizens’ initiatives with integrated argumentation) [1]. An authentication-by-reputation technique(More)
We introduce protocols for a fully decentralized synchronization of data items among equal peers in an argumentation framework (for applications such as debates in petition signature drives, and deliberation among shareholders). Here, an argumentation is a structured exchange of justifications around issues (or motions). The motions are relevant to(More)
The discussed "Stacking the Deck" attack and our solution are relevant only to software controlled by loosely constituted communities. Developers can change their vision and abandon features that are essential for certain users. Moreover, well funded attackers can effectively take control of a project by orchestrating the transfer of the leadership of the(More)
Khalid Alhamed Bruno BEAUFILS Nesrine Besghaier Henrique Cardoso Meng Chang Hongbo Chen Filipe Coelho Sam Devlin Luigi Di Caro Ayan Dutta Kyriakos Efthymiadis Hui Fang Jelena Fiosina Maksims Fiosins Gianluigi Greco Hong Jia Siwei Jiang Janyl Jumadinova Xin Liu Kleanthis Malialis Lena Mashayekhy Sebastien PICAULT Jean-Christophe Routier Nikolaos Spanoudakis(More)
A JAR (Java Archive) is typically used to incorporate code and associated resources into one file to distribute Java software. A cryptographically signed JAR file provides assurance about the authorship of the contents of the archive. We use Signed JAR files as part of a recommendation system. In this system different recommenders will evaluate the same(More)
Peer-to-peer infrastructures in a world where many systems are mobile, or found behind NATs and firewalls that cannot be programmed by users, require significant support from computers with appropriate connectivity, called supernodes. We introduce a new fully decentralized unstructured peer-to-peer (P2P) approach to open-source instant messaging systems(More)