We will review some of the major results in random graphs and some of the more challenging open problems. We will cover algorithmic and structural questions. We will touch on newer models, including those related to the WWW.

Random graphs

This document provides updates to IEEE Std 802.16's MIB for the MAC, PHY and asso- ciated management procedures in order to accommodate recent extensions to the standard.

IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Fixed Broadband Wireless Access Systems Draft Amendment: Management Information Base Extensions

The Net Delusion: The Dark Side of Internet Freedom by Evgeny Morozov New York: Public Affairs, 2011 409 pages $16.99 [ILLUSTRATION OMITTED] In January 2010, Secretary of State Hillary Clinton gave a highly touted speech on Internet freedom in which she stated, "The freedom to connect is like the freedom of assembly, only in cyberspace. It allows individuals to get online, come together, and hopefully cooperate. Once you're on the Internet, you don't need to be a tycoon or a rock star to have a huge impact on society." Evgeny Morozov, in his book The Net Delusion, takes great issue with the implication, however, that the so-called "Arab Spring" and "Twitter Revolution" were caused by unfettered access to the Internet. Instead, Morozov, a research academic, provides a cautionary tale about what he argues is any attempt to establish a monocausal relationship to meaningful political change (especially when that single focus is information technology). The book opens with a discussion of cyber-utopianism and Internet-centrism--mind-sets that focus on the positive "emancipatory" aspects of Internet communication while ignoring the downsides. The argument throughout centers on nation-state policy, or lack thereof, that attacks the "wicked" problem of authoritarianism by, as a colleague of mine has dubbed it, "wiring the world." Morozov, expectantly, but importantly, cites the hedonistic world portrayed by Huxley and the "Big Brother" world of Orwell to consider both the proactive and reactive approaches to Internet freedom by authoritarian regimes. Interestingly, he notes that there is often a mix of both. Such regimes certainly use the anonymity and openness of the Internet to spy on their people and shutdown undesirable sites. But there is also a subtle approach that belies the jackboot on the keyboard methodology. While China may be known more for suppressing the Internet and for employing the masses to counter antiregime rhetoric, Russia imposes no formal Internet censorship. It relies on entertainment (porn is specifically cited) to soothe the masses, assuming that given options for political discourse and anything else, most opt for "anything else." Hitler would understand. And in nations where freedom is not widely understood from a western perspective, any bit of additional mindless diversion may be viewed as liberty by the populace. Perhaps most importantly, Morozov rails against social media determinism as driving the end of authoritarianism, labeling it "an intellectually impoverished, lazy way to study the past, understand the present, and predict the future." He does not dismiss the value of Facebook and Twitter to quickly mobilize like-minded individuals. He notes as well that the development of that very like-mindedness is complex and potentially can be manipulated by authoritarian governments using the same Internet freedom. …

The Net Delusion: The Dark Side of Internet Freedom

Cengage Learning, 2000. Book Condition: New. Brand New, Unread Copy in Perfect Condition. A+ Customer Service! Summary:

Applied Nonparametric Statistics

Designs on Nature: Science and Democracy in Europe and the United States

Wireless communications have received much attention during the last decades due to easy implementation, the possibility of delivering multimedia services to rural communities, and the suitability for public safety and for communicating in emergency situations. In particular, a wireless network designed for an emergency scenario must be capable of monitoring sensitive areas and must enable people to connect immediately after a disaster. This article discusses the main features of a wireless network that aims to interconnect several heterogeneous systems and provide multimedia access to groups of people to better monitor a specific area, to have a fast response in case of a disaster, and to efficiently coordinate all of the forces during the disaster management phase.

A broadband wireless communications system for emergency management

In a wireless communications network including at least one authenticator and at least one authentication server, wherein the authenticator is adapted to interact with the authentication server for authenticating supplicants in order to conditionally grant thereto access to the wireless communications network, a short authentication method for authenticating a supplicant, the method including: providing a shared secret, shared by and available at the supplicant and the authentication server; having the supplicant provide to the authenticator an authentication token, wherein the authentication token is based on the shared secret available thereat; having the authenticator forward the authentication token to the authentication server; having the authentication server ascertain an authenticity of the received authentication token based on the shared secret available thereat; in case the authenticity of the authentication token is ascertained, having the authentication server generate a first authentication key based on the shared secret available thereat, and provide the generated authentication key to the authenticator; having the supplicant generate a second authentication key based on the shared secret; and having the supplicant and the authenticator exploit the generated first and the second keys for communicating with each other. The short authentication method is particularly useful in situations of handoff of the supplicant from an authenticator to another.

Short authentication procedure in wireless data communications networks

Wireless Community Networks (WCNs) are created and managed by a local community with the goal of sharing Internet connection and offering local services. This paper analyses the data collected on three large WCNs, ranging from 131 to 226 nodes, and used daily by thousands of people. We first analyse the topologies to get insights in the fundamental properties, next we concentrate on two crucial aspects: (i) the routing layer and (ii) metrics on the centrality of nodes and the network robustness. All the networks use the Optimized Link State Routing (OLSR) protocol extended with the Expected Transmission Count (ETX) metric. We analyse the quality of the routes and two different techniques to select the Multi-Point Relay (MPR) nodes. The centrality and robustness analysis shows that, in spite of being fully decentralized networks, an adversary that can control a small fraction of carefully chosen nodes can intercept up to 90% of the traffic. The collected data-sets are available as Open Data, so that they can be easily accessed by any interested researcher, and new studies on different topics can be performed. In fact, WCN are just an example of large wireless mesh networks, so our methodology can be applied to any other large mesh network, including commercial ISP networks.

/pdf/a-week-in-the-life-of-three-large-wireless-community-4byy9v8cth.pdf

A week in the life of three large Wireless Community Networks

Do we need a contact tracing app

This paper analyzes some critical security issues in the family of IEEE 802.16 standard that has not been addressed so far. In particular two of the key features of the standard, the dynamic resources allocation and the mesh mode revealed to be vulnerable to attacks that represent serious threats to the robustness and privacy of the communications. In the first case the attacker is able to reduce bandwidth assigned to its neighbors, with the aim of obtaining more resources for himself; in the second case, we observed that there might be no real privacy in communications between two nodes of the mesh network. These vulnerabilities are still present even after the latest amendment to the standard, IEEE 802.16e that solved some previously addressed security flaws.

Leonardo Maccari

Papers

A broadband wireless communications system for emergency management

Short authentication procedure in wireless data communications networks

A week in the life of three large Wireless Community Networks

Do we need a contact tracing app

Security Analysis of IEEE 802.16