CCM - Histoire d'Internet Novembre 2017 L'idée révolutionnaire En 1962, alors que le communisme faisait force, l'US Air Force demande à un petit groupe de chercheurs de créer un réseau de communication militaire capable de résister à une attaque nucléaire. Le modèle de Baran Paul Baran est considéré comme un des acteurs principaux de la création d'Internet. En août 1969, indépendamment de tout objectif militaire, le réseau expérimental ARPANET fut créé par l'ARPA (Advanced Research Projects Agency dépendant du DOD, Department of Defense) afin de relier quatre instituts universitaires : Le Stanford Institute ; L'université de Californie à Los Angeles ; L'université de Californie à Santa Barbara ; L'université d'Utah. Le réseau ARPANET est aujourd'hui considéré comme le réseau précurseur d'internet. Un ou plusieurs noeuds du réseau pouvait être détruits sans perturber son fonctionnement ; La communication entre machines se faisait sans machine centralisée intermédiaire ; Les protocoles utilisés étaient basiques. Le DNS
Internet Society (ISOC) All About The Internet: History of the Internet The original ARPANET grew into the Internet. Internet was based on the idea that there would be multiple independent networks of rather arbitrary design, beginning with the ARPANET as the pioneering packet switching network, but soon to include packet satellite networks, ground-based packet radio networks and other networks. The Internet as we now know it embodies a key underlying technical idea, namely that of open architecture networking. In an open-architecture network, the individual networks may be separately designed and developed and each may have its own unique interface which it may offer to users and/or other providers. including other Internet providers. The idea of open-architecture networking was first introduced by Kahn shortly after having arrived at DARPA in 1972. However, NCP did not have the ability to address networks (and machines) further downstream than a destination IMP on the ARPANET and thus some change to NCP would also be required.
Encryption For as long as people have needed to conduct private conversations across distances, a variety of encryption methods have been used to protect secret communications. However, the introduction of electronic communications networks raised an old encryption problem to a new level -- how do two people establish secure communications when they live so far apart that they can't meet first to exchange a secret decryption key? The solution to this problem is an encryption method called Public Key Cryptography (PKC), an ingenious mathematical structure that doesn't need participants to meet beforehand to conduct secure communications. PKC technology also provides a clever method of attaching an encrypted signature to a message to guarantee authenticity. PKC is now the engine for almost all high grade encryption on the Internet, including financial transactions on websites and implementation of the highest level virtual private networks. The following sections provide more information.
Réseaux informatiques Communication entre machines non directement connectées National Library of Medicine - National Institutes of Health Packet Switching What is packet switching? Like the development of hypertext, packet switching is an idea that seems to want to have been discovered, found independently within a few years by two different people separated by one of the earth's largest oceans. The revolutionary concept formed the foundation for the design of the ARPANET, and then the Internet Protocol, providing the key enabling technology that has led to the success of the Internet today. The packet switching concept was a radical paradigm shift from the prevailing model of communications networks using dedicated, analog circuits primarily built for audio communications, and established a new model of discontinuous, digital systems that break messages into individual packets that are transmitted independently and then assembled back into the original message at the far end. Packet Switching History How Packets Work How Switching Works.
Internet History One-Page Summary - How Invented, Created The conceptual foundation for creation of the Internet was largely created by three individuals and a research conference, each of which changed the way we thought about technology by accurately predicting its future: Vannevar Bush wrote the first visionary description of the potential uses for information technology with his description of the "memex" automated library system. Norbert Wiener invented the field of Cybernetics, inspiring future researchers to focus on the use of technology to extend human capabilities. The 1956 Dartmouth Artificial Intelligence conference crystallized the concept that technology was improving at an exponential rate, and provided the first serious consideration of the consequences. Marshall McLuhan made the idea of a global village interconnected by an electronic nervous system part of our popular culture. The first networking protocol used on the ARPANET was the Network Control Program. In 1990, the ARPANET was retired and transferred to the NSFNET.
Reference, Facts, News - Free and Family-friendly Resources - Refdesk.com Historique du réseau - Internet dans le monde - Dossiers Du réseau ARPANET à Internet Arpanet : 88 ordinateurs connectés entre eux, 1982. © Field museum/Joyce Reynolds Agrandir l'image L'origine d'internet vient d'une initiative d’une agence du département américain de la défense à la fin des années 1960, la DARPA (Defense Advanced Research Projects Agency, soit Agence pour les projets de recherche avancée de défense) visant à réaliser un réseau de transmission de données (transfert de paquets) à grande distance entre différents centres de recherche sous contrat. La connexion entre tous les réseaux existants, c'est-à-dire "l'internet" proprement dit, n'est devenue possible qu'avec la définition de normes communes. En 1970, a été créé un premier protocole de communication, le NCP (Network Communication Protocol). La création du World Wide Web Internet s’ouvre véritablement au grand public avec la création, lors du Centre européen pour la recherche nucléaire (CERN), en 1991, du World Wide Web, par Tim Berners-Lee. L’essor d’internet
Home Page August 7, 2012 To all my educator colleagues: As you all know, I retired in June of 2011 from my school district job as Director of Technology. I retired to spend more time learning new things to support you as you embed technology into teaching and learning in a meaningful way. I now have the time to visit districts and help with their technology-related initiatives, teach online graduate courses for the Wilkes/Discovery Masters program, and host several webinar series. Also, with this retirement, I have had the time to develop and enhance some online information sources for you. Since I started the Schrockguide in June of 1995, a lot has changed. However, I am not retired from providing you with great resources and ideas to support teaching and learning! I have moved all the support information for my presentations over to Kathy Schrock's Guide to Everything, located here, to help you as you think about the practical and pedagogical uses of technology. Kathy
INTERNET - Ecyclopédia Universalis Internet est issu du réseau Arpanet, créé aux États-Unis en 1969 sous l'impulsion de la D.A.R.P.A. (Defense Advanced Research Projects Agency). Arpanet avait un double objectif : d'une part, échanger des informations entre universités et militaires, et, d'autre part, expérimenter les techniques de transmission de données découpées en paquets [cf. réseaux informatiques]. Au milieu des années 1970, d'autres types de réseaux émergent, en particulier les réseaux locaux d'entreprise. Pour favoriser l'adoption des protocoles TCP et IP, la D.A.R.P.A. subventionna leur intégration au système d'exploitation Unix, qui était alors distribué à bas prix aux universités.