Secure Content Distribution with Access Control Enforcement in Named Data Networking

NDN is one of the new emerging future internet architectures which brings up new solutions over today’s internet architecture, facilitating content distribution, in-network caching, mobility support, and multicast forwarding. NDNs ubiquitous in-network caching allows consumers to access data directly from the intermediate router’s cache. However, it opens content privacy problems since data packets replicated in the router are always accessible by every consumer. Sensitive contents in the routers should be protected and accessed only by authorized consumers. Although the content protection problem can be solved by applying an encryption-based access control policy, it still needs an efficient content distribution scheme with lower computational overhead and content retrieval time. We propose an efficient and secure content distribution (ES_CD), by combining symmetric encryption and identity-based proxy re-encryption. The analysis shows that our proposed scheme achieves content retrieval time reduction up to 20% for the cached contents in our network simulation environment and a slight computational overhead of less than 19 ms at the content producer and 9 ms at the consumer for 2 KB content. ES_CD provides content confidentiality and ensures only legitimate consumers can access the contents during a predefined time without requiring a trusted third party and keeping the content producer always online.

Employing chatbots for data collection in participatory journalism and crisis situations

The journalistic profession has long since entered an age where technology and audience participation are two of its most defining factors. Changes that were brought about by the advent of WEB 2.0 transformed journalism – among other professions – fundamentally, and opened the gates to a more connected future, one in which the lines between content producer and content consumer are far less defined than they used to be. One of the more promising technologies of this new era is that of chatbots and conversational agents. These multifaceted programs have proven to be extremely useful in many aspects of modern journalism, with some of them getting used in scenarios that go as far as trying to replace the traditional role of the journalist as we know it. As such, the influence of these programs has also spread to the field of audience interaction and participatory journalism. This article aims to underline the integral role that chatbots play within the confines of the journalistic profession, while at the same time explore the significant effects they have in the field of audience participation and communication between the journalist and the public in general. To achieve this goal a model chatbot was created in order to demonstrate the benefits of automating the process of filing and transferring a report on account of the public to the news organization.

Analytical modelling solution of producer mobility support scheme for named data networking

Named Data Networking (NDN) is a clean-slate future Internet architecture proposed to support content mobility. However, content producer mobility is not supported fundamentally and faces many challenges such as, high handoff latency, signaling overhead cost and unnecessary Interest packet losses. Hence, many approaches indirection-based approach, mapping-based approach, locator-based approach and control/data plane-based approach were proposed to address these problems. Mapping-based and control/data plane-based approach deployed servers for name resolution serveces to provide optimal data path after handoff, but introduces high handoff latency and signalling overhead cost. Indirection-based and locator-based approach schemes provide normal handoff delay, but introduces sub-optimal or tiangular routing path. Therefore, there is needs to provide substantial producer mobility support that minimizes the handoff latency, signaling cost and improve data packets delivery via optimal path once a content producer relocates to new location. This paper proposed a scheme that provides optimal data path using mobility Interest packets and broadcasting strategy. Analytical investigation result shows that our proposed scheme outperforms existing approaches in terms of handoff latency, signaling cost and path optimization.

Whither the future of feature writing?

Historically feature writers occupied a privileged, often protected, position in a newsroom. While news reporters were required to produce copy to a tight deadline, the feature writer had the luxury of time in which to craft a well-researched and argued piece. Today, that is rarely the case. Feature writers are no longer inured from every day newsroom pressures. They’re expected to produce news as well as features, a reality which has contributed to a decline in the quality of longer form journalism. While technology has promoted greater interactivity among writer and audience, or content producer and audience in the case of online features, the focus and scope of features has changed immeasurably.

Confrontations et convergences éthiques entre marketing et information autour de la publicité native

La perméabilité de la division information/publicité dans les salles de rédaction fait récursivement l’objet de débats au sein de l’industrie journalistique. Mus par des logiques différentes, univers marketing et journalistique sont supposés se prémunir de toute influence mutuelle. L’arrivée des plateformes socio numériques, l’éclatement du modèle économique des médias d’information et l’irritation face à l’intrusion publicitaire et les stratégies de blocage encouragent de nouveaux chevauchements, dont la publicité native (PN). Les différentes justifications ou critiques de cette technique controversée constituent une entrée pour analyser le rapport à l’éthique des deux professions, journalisme et marketing. Cette communication propose d’interroger ce phénomène par une double analyse. D’abord en repérant dans le discours des professionnels du marketing et de l’information les différentes rationalités entourant l’utilisation, ou non, de la PN. Ces rationalités sont ensuite adossées aux codes, chartes et guides déontiques. Au final, nous arguons que les guides actuels sont insuffisants pour encadrer le bouleversement professionnel qu’engendre la PN, entre autres sous la force de tensions séculaires, mais fortement bousculées par des rationalités convergentes. Ce paradoxe semble se solder par l’arrivée d’un nouveau type de professionnel, le producteur de contenu. Nous ouvrons quelques pistes pour explorer plus avant cette transformation professionnelle. Mots Clés : publicité native, journalisme, analyse de discours, éthique The porousness of the information/advertising division in newsrooms is a recursive topic of debate in the journalism industry. With their distinct logics, the worlds of marketing and journalism are supposed to guard against any mutual influence, as enshrined in ethical codes and charters. But the rise of social media platforms, the fragmentation of the economic model of the news media, the irritation of advertising intrusion, and the ad blocking software are encouraging new overlaps, one being native advertising (NA). The various justifications or criticisms of this controversial technique constitute for us the entry point to analyze the ethics of both journalism and marketing in regard of NA. First, we identify, within the discourse of both marketing and information professionals, the different rationalities surrounding the use or non use of NA. These rationalities are then compared to codes, charters and deontic guides in use. In the end, we argue that the current guides are insufficient to frame the professional upheaval that NA generates, under the force of deep-rooted tensions, now strongly shaken by convergent economical rationalities. This paradox seems to result in the arrival of a new type of professional, the content producer. We open up some avenues to explore this professional transformation further. Keywords: Ethics, deontology, native advertising, marketing, journalism

Publish/subscribe scheme for content centric MANETs

It is allowed that data of the content producer is cached anywhere in Content Centric MANET (CCMANET). This scheme decoupling of data from the data source make traditional end-end authentication transmission unavailable in CCMANET. So, it is a challenge how to ensure content publishing or subscribing only by legitimate users. In this paper, we firstly design a new Yaksha system on Elliptic Curve (EC-Yaksha), and then a secure Content Publish/Subscribe System based on EC-Yaksha (ECY-CPS) for CCMANET is proposed. In ECY-CPS, EC-Yaksha server manages joining or leaving of network users and distributes ?license? only to legitimate user for content publishing or subscribing. Such, it is guaranteed that only the legitimate users can publish content to network or access content cached in network. In addition, using of the license can efficiently defend common attacks such as the interest flooding and the content pollution etc. Finally, we prove security properties of ECY-CPS in PCL and make a simple comparison between our system and the related solution.

Working with or next to each other? Boundary crossing in the field of information visualisation

Due to the need to present information in a fast and attractive way, organizations are eager to use information visualisations. This study explores the collision between the different experts involved in the production of these visualisations using the model of trading zones supplemented with the learning mechanisms found in the boundary crossing literature. Results show that that there is not one good solution to effective interdisciplinary cooperation in the field of information visualisation. All four types of cooperation that we distinguish – enforced, dominated, fractionated, and attuned – might work well, as long as they are adapted to the situation. In any case the involved experts and initiators have to understand and incorporate approaches that enhance the co-creative, iterative nature of the production process. Overlooking the different forms of collaboration we detect two major forms of trading zones: the one that encompasses the collaboration between an external client and a designer (external trading zone) and the trading zones within an organization between content producer and designer (internal trading zone). Both mechanisms of identifying each other’s expertise and coordinating the different tasks in the production process seem beneficial for the production process.

Engineered Biosynthesis of Disaccharide-Modified Polyene Macrolides

ABSTRACTRecent work has uncovered genes for two glycosyltransferases that are thought to catalyze mannosylation of mycosaminyl sugars of polyene macrolides. These two genes arenypYfromPseudonocardiasp. strain P1 andpegAfromActinoplanes caeruleus. Here we analyze these genes by heterologous expression in various strains ofStreptomyces nodosus, producer of amphotericins, and inStreptomyces albidoflavus, which produces candicidins. The NypY glycosyltransferase converted amphotericins A and B and 7-oxo-amphotericin B to disaccharide-modified formsin vivo. The enzyme did not act on amphotericin analogs lacking exocyclic carboxyl or mycosamine amino groups. Both NypY and PegA acted on candicidins. This work confirms the functions of these glycosyltransferases and provides insights into their acceptor substrate tolerance. Disaccharide-modified polyenes may have potential as less toxic antibiotics.

The Business Value of Consumer Participation through Social Media

Despite the growing enthusiasm about social media’s revolutionary potential, there is a lack of research on the possible business-side benefits. The authors maintain that in order to realize social media’s business potential, it is essential to identify the roles in which customers can participate in value co-creation. This study explores consumer participation enabled by social interaction technologies in the context of the newspaper and magazine industry. A qualitative analysis of 31 interviews with the publishers of the leading Finnish newspapers and magazines was conducted. A typology of six different roles of online consumer participation was developed: namely, agent, commentator, tester, debater, content producer, and messenger. The more company-driven types of participation (agent, commentator, and tester) can be integrated with product development support and learning from customers, the more consumer-driven types (debater, content producer, and messenger) are able to provide brand support and options for value co-creation.