Security policies and trust in ubiquitous computing

2008 ◽  
Vol 366 (1881) ◽  
pp. 3769-3780 ◽  
Author(s):  
Anupam Joshi ◽  
Tim Finin ◽  
Lalana Kagal ◽  
Jim Parker ◽  
Anand Patwardhan
Keyword(s):  
Short Range ◽  
Ad Hoc ◽  
Peer Interactions ◽  
Wearable Devices ◽  
Security And Privacy ◽  
Security Policies ◽  
Dynamic Nature ◽  
Internet Connectivity ◽  
Hoc Networks ◽  
Information Interchange

Ubiquitous environments comprise resource-constrained mobile and wearable devices and computational elements embedded in everyday artefacts. These are connected to each other using both infrastructure-based as well as short-range ad hoc networks. Limited Internet connectivity limits the use of conventional security mechanisms such as public key infrastructures and other forms of server-centric authentication. Under these circumstances, peer-to-peer interactions are well suited for not just information interchange, but also managing security and privacy. However, practical solutions for protecting mobile devices, preserving privacy, evaluating trust and determining the reliability and accuracy of peer-provided data in such interactions are still in their infancy. Our research is directed towards providing stronger assurances of the reliability and trustworthiness of information and services, and the use of declarative policy-driven approaches to handle the open and dynamic nature of such systems. This paper provides an overview of some of the challenges and issues, and points out directions for progress.

scholarly journals Rechained: Sybil-Resistant Distributed Identities for the Internet of Things and Mobile Ad Hoc Networks

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 3257
Author(s):  
Arne Bochem ◽  
Benjamin Leiding
Keyword(s):  
Internet Of Things ◽  
Ad Hoc ◽  
Upper And Lower Bounds ◽  
Colored Petri Nets ◽  
Security Level ◽  
Internet Connectivity ◽  
Mobile Ad Hoc ◽  
Hoc Networks ◽  
Detection Schemes ◽  
The Internet Of Things

Today, increasing Internet of Things devices are deployed, and the field of applications for decentralized, self-organizing networks keeps growing. The growth also makes these systems more attractive to attackers. Sybil attacks are a common issue, especially in decentralized networks and networks that are deployed in scenarios with irregular or unreliable Internet connectivity. The lack of a central authority that can be contacted at any time allows attackers to introduce arbitrary amounts of nodes into the network and manipulate its behavior according to the attacker’s goals, by posing as a majority participant. Depending on the structure of the network, employing Sybil node detection schemes may be difficult, and low powered Internet of Things devices are usually unable to perform impactful amounts of work for proof-of-work based schemes. In this paper, we present Rechained, a scheme that monetarily disincentivizes the creation of Sybil identities for networks that can operate with intermittent or no Internet connectivity. We introduce a new revocation mechanism for identities, tie them into the concepts of self-sovereign identities, and decentralized identifiers. Case-studies are used to discuss upper- and lower-bounds for the costs of Sybil identities and, therefore, the provided security level. Furthermore, we formalize the protocol using Colored Petri Nets to analyze its correctness and suitability. Proof-of-concept implementations are used to evaluate the performance of our scheme on low powered hardware as it might be found in Internet of Things applications.

scholarly journals Spectrum aware clustering in cognitive radio ad hoc networks

2018 ◽  
Vol 7 (2.30) ◽  
pp. 27
Author(s):  
Aishwarya Sagar Anand Ukey ◽  
Meenu Chawla
Keyword(s):  
Cognitive Radio ◽  
Ad Hoc Networks ◽  
Ad Hoc ◽  
Cluster Formation ◽  
Clustering Algorithms ◽  
Radio Spectrum ◽  
Dynamic Nature ◽  
Secondary Users ◽  
Hoc Networks ◽  
Maintenance Process

Cognitive radio (CR) is an emerging technology developed for efficient utilization of the radio spectrum. CRN utilizes CR technology and enables the unlicensed users also referred as secondary users (SUs) to access free portions of the licensed spectrum in an opportunistic manner. To support scalability and stability in distributed CRNs also referred as cognitive radio ad hoc networks (CRAHNs), SUs are often organized into smaller groups known as clusters. Spectrum aware clustering is considered as the key technique to overcome numerous is-sues associated with the dynamic nature of CRAHNs. This article focuses on clustering in CRAHNs and presents a comprehensive review of various spectrum aware clustering algorithms presented in the literature. The article highlights notable clustering metrics and includes the description of cluster formation and maintenance process. The article also renders potential research gaps in existing research works and discusses open challenges and issues that need to be addressed for efficient clustering in CRAHNs. 

Multi-Scenarios Vehicle Traces Modeling in Co-Simulation of Vehicular Ad-Hoc Networks

2012 ◽  
Vol 178-181 ◽  
pp. 2694-2698
Author(s):  
Jiang Feng Wang ◽  
Shuo Nie ◽  
Xue Dong Yan ◽  
Wang Xiang
Keyword(s):  
Wireless Communication ◽  
Ad Hoc Networks ◽  
Short Range ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Modeling Tools ◽  
Average Speed ◽  
The Difference ◽  
Hoc Networks

Vehicular ad hoc networks (VANETs) form when vehicles are equipped with devices capable of short-range wireless communication. Realistic vehicle trace modeling for VANETs simulations is a challenging task, which requires the reliable characterization of vehicular mobility. In this study, three different vehicle scenarios are proposed to analyze the difference between vehicle traces in multi-scenarios: city road, expressway and highway. Common trace modeling tools and characters of the scenarios are explored. Furthermore, three experimental scenarios are established using VanetMobiSim to produce vehicle traces. The experimental results show that the trend of the average speed versus the number of vehicles is different, and the vehicular density distribution demonstrates the realism of vehicle trace under multi-scenarios.

scholarly journals Routing and Scheduling Issues in Vehicular Ad-hoc Networks

2019 ◽  
Vol 8 (3) ◽  
pp. 4272-4283
Keyword(s):  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Wave Model ◽  
Intelligent Vehicles ◽  
Security And Privacy ◽  
Research Issues ◽  
Routing And Scheduling ◽  
Hoc Networks ◽  
Privacy Issues ◽  
Stable Network

VANETs have developed as one of the largest potential topics in the field of automotive industries with promising and challenging futures in various aspects. VANETs permit intelligent vehicles to generate their own organized network without the need of the stable network. In this paper we introduce VANETs and its comparison with MANETs, standard wireless access in VANETs like WAVE model partly based on OSI model. We present a comprehensive study on routing protocol in VANETs like position-based routing, Geo-Cast based routing, etc. and scheduling in VANETs like deadline-based scheduling, hybrid-based scheduling, etc. This paper presents open research issues in VANETs highlighting challenges like security and privacy issues, network congestion control issues, etc, numerous routing and scheduling issues in VANETs.

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