Search results for "ACCESS CONTROL"

showing 10 items of 79 documents

An Experimental Testbed and Methodology for Characterizing IEEE 802.11 Network Cards

2006

It has been observed that IEEE 802.11 commercial cards produced by different vendors show a different behavior in terms of perceived throughput or access delay. Performance differences are evident both when the cards contend alone to the channel, and when heterogeneous cards contend together. Since the performance misalignment does not disappear by averaging the environmental factors (such as propagation conditions, laptop models, traffic generators, etc), it is evident that the well known throughput-fairness property of the DCF protocol is not guaranteed in actual networks. In this paper we propose a methodological approach devised to experimentally characterize the IEEE 802.11 commercial …

Inter-Access Point ProtocolComputer sciencebusiness.industryReal-time computingWireless local area networks (WLAN)Network allocation vectorThroughputbackoff algorithmIEEE 802.11Network interface controllerMedia access controlIEEE 802.11e-2005IEEE 802.1XbusinessThroughput (business)Computer network
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Opportunistic Synchronization for Improving IEEE 802.15.4 MAC Performance in Chain Topologies

2010

The most effective solution for energy saving in low-rate wireless sensor networks is maintaining each node in a doze state as long as possible. In order to guarantee network connectivity, the intervals at which the network sensors are turned on and off have to be coordinated. Therefore, synchronization is a very critical function for sensor networks. In this paper, we analyze the IEEE 802.15.4 MAC performance in sensor networks deployed in a chain topology. For this topology, critical inefficiencies can arise in case of multi-hop packet deliveries. We evaluate the impact of different synchronization schemes on the network performance, both in terms of network throughput and in terms of ene…

sensor networks medium access control energy savingSettore ING-INF/04 - AutomaticaSettore ING-INF/03 - Telecomunicazioni
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A Patient-Centric Attribute Based Access Control Scheme for Secure Sharing of Personal Health Records Using Cloud Computing

2016

Personal health records (PHR) are an emerging health information exchange model, which facilitates PHR owners to efficiently share their private health data among a variety of users including healthcare professionals as well as family and friends. PHRs are usually outsourced and stored in third-party cloud platforms which relieves PHR owners from the burden of managing their PHR data while achieving better availability of health data. However, outsourcing private health data raises significant privacy concerns because there is a higher risk of leaking health information to unauthorized parties. To ensure PHR owners' control of their outsourced PHR data, attribute based encryption (ABE) mech…

020203 distributed computingbusiness.industryComputer scienceInternet privacy020206 networking & telecommunicationsAccess controlHealth information exchangeCloud computing02 engineering and technologyEncryptionComputer securitycomputer.software_genreOutsourcingResource (project management)Health care0202 electrical engineering electronic engineering information engineeringAttribute-based encryptionbusinesscomputer2016 IEEE 2nd International Conference on Collaboration and Internet Computing (CIC)
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Security, Reliability and Usability of mHealth Environments

2015

Mobile technologies confer mobility and autonomy on patients with the advantage of access to home care and health care services on demand. However, these benefits impose challenges to the future health care services. For instance, computation capacity of a conventional smartphone provides applications and services with sufficient power of calculation and automation to assist in daily life activities and medical purposes. Combined with a user-friendly interface, mobile technologies can be an easy and efficient manner to help people who are in a condition of cognitive deterioration or have a chronic disease which demands a close connection to near family members and/or to health care services.

business.industryComputer scienceInternet privacyUsability engineeringHealth careUsabilityMobile technologyAccess controlCustomer relationship managementUser interfacebusinessmHealth
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Decentralized Lightweight Group Key Management for Dynamic Access Control in IoT Environments

2020

Rapid growth of Internet of Things (IoT) devices dealing with sensitive data has led to the emergence of new access control technologies in order to maintain this data safe from unauthorized use. In particular, a dynamic IoT environment, characterized by a high signaling overhead caused by subscribers' mobility, presents a significant concern to ensure secure data distribution to legitimate subscribers. Hence, for such dynamic environments, group key management (GKM) represents the fundamental mechanism for managing the dissemination of keys for access control and secure data distribution. However, existing access control schemes based on GKM and dedicated to IoT are mainly based on ce…

PROTOCOLSCRYPTOGRAPHYComputer Networks and CommunicationsComputer scienceGROUP COMMUNICATIONKey distributionCore networkRESEAU INFORMATIQUEAccess control02 engineering and technologySCALABILITYTECHNOLOGIE SANS FIL[SPI]Engineering Sciences [physics][INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI]TELECOMMUNICATIONForward secrecy0202 electrical engineering electronic engineering information engineeringRekeyingINTERNET OF THINGSElectrical and Electronic EngineeringINTERNETSECURITEDYNAMIC ENVIRONMENTSECURITYIOTTRAITEMENT DES DONNEESbusiness.industryKey distribution center020206 networking & telecommunicationsWIRELESS SENSOR NETWORKSRESEAU DE TELECOMMUNICATIONSGROUP KEY MANAGEMENTINFORMATIQUECommunication in small groupsScalabilityARCHITECTURE CLIENT-SERVEURbusinessCOMPUTER ARCHITECTUREACCESS CONTROLComputer network
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A space-division time-division multiple access scheme for high throughput provisioning in WLANs

2005

Directional antennas may dramatically increase the capacity of a Wireless LAN by allowing several stations to simultaneously communicate. Since deployment of directive/smart antennas on the customer's terminals is awkward (for technological, cost, robustness, and convenience reasons) it is of interest to deploy advanced antenna solutions only at the Access Point. When omnidirectional transmissions are used at the Mobile Stations, the asynchronous nature of the 802.11 MAC handshake structurally limits the possibility to exploit spatial reuse. Significant throughput enhancements can be achieved only at the expense of redesigning (part of) the 802.11 MAC protocol: mainly a form of synchronizat…

Mobile radioDirectional antennaComputer sciencebusiness.industryComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSTime division multiple accessSmart antennaMedium access controlThroughputSpace-division multiple accessInterference (wave propagation)Backward compatibilityAsynchronous communicationWireless landirectional antennaDirective antennasbusinessOmnidirectional antennaComputer network
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Attribute based access control scheme with controlled access delegation for collaborative E-health environments

2017

Abstract Modern electronic healthcare (e-health) settings constitute collaborative environments with complex access requirements. Thus, there is a need for sophisticated fine-grained access control mechanisms to cater these access demands and thereby experience the full potential of e-health systems. In order to realize a flexible access control scheme, integrating access delegation is of paramount importance. However, access delegation has to be enforced in a controlled manner so that it will not jeopardize the security of the system. In this paper, we addressed this issue through proposing an attribute based access control scheme integrated with controlled access delegation capabilities. …

Scheme (programming language)Computer access controlDelegationRevocationComputer Networks and CommunicationsComputer sciencebusiness.industrymedia_common.quotation_subject020206 networking & telecommunications020207 software engineeringProvisioningAccess control02 engineering and technologyComputer securitycomputer.software_genre0202 electrical engineering electronic engineering information engineeringPhysical accessRole-based access controlSafety Risk Reliability and QualitybusinesscomputerSoftwaremedia_commoncomputer.programming_languageJournal of Information Security and Applications
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Revisit of RTS/CTS Exchange in High-Speed IEEE 802.11 Networks

2005

IEEE 802.11 medium access control (MAC), called distributed coordination function (DCF), provides two different access modes, namely, 2-way (basic access) and 4-way (RTS/CTS) handshaking. The 4-way handshaking has been introduced in order to combat the hidden terminal phenomenon. It has been also proved that such a mechanism can be beneficial even in the absence of hidden terminals, because of the collision time reduction. We analyze the effectiveness of the RTS/CTS access mode, in current 802.11b and 802.11a networks. Since the rates employed for control frame transmissions can be much lower than the rate employed for data frames, the assumption on the basis of the 4-way handshaking introd…

Hidden node problembusiness.industryComputer scienceReal-time computingFrame (networking)Wireless local area networks (WLAN)Distributed coordination functionThroughputbackoff algorithmHandshakingMedia access controlMultiple Access with Collision Avoidance for WirelessIEEE 802.11e-2005businessCarrier sense multiple access with collision avoidanceComputer networkSixth IEEE International Symposium on a World of Wireless Mobile and Multimedia Networks
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Towards Risk-aware Access Control Framework for Healthcare Information Sharing

2018

business.industryComputer scienceInformation sharingInternet privacyHealth care0202 electrical engineering electronic engineering information engineering020206 networking & telecommunications020201 artificial intelligence & image processingAccess control02 engineering and technologybusinessProceedings of the 4th International Conference on Information Systems Security and Privacy
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Blockchain Based Delegatable Access Control Scheme for a Collaborative E-Health Environment

2018

Modern electronic healthcare (e-health) settings constitute collaborative environments requiring sophisticated fine-grained access control mechanisms to cater their access demands. Access delegatability is quite crucial to realize fine-grained, flexible access control schemes compatible with such environments. In this paper, we addressed this issue through proposing an attribute based access control scheme integrated with controlled access delegation capabilities suitable for a multi-domain e-health environment. We have utilized the blockchain technology to manage attribute assignments, delegations as well as revocations. The scheme enables delegations in a controlled manner without jeopard…

Scheme (programming language)DelegationRevocationbusiness.industryComputer sciencemedia_common.quotation_subject010401 analytical chemistryControl (management)Overhead (engineering)020206 networking & telecommunicationsAccess control02 engineering and technologyAttribute-based access controlComputer securitycomputer.software_genre01 natural sciences0104 chemical sciences0202 electrical engineering electronic engineering information engineeringInformationSystems_MISCELLANEOUSbusinessKey managementcomputermedia_commoncomputer.programming_language2018 IEEE International Conference on Internet of Things (iThings) and IEEE Green Computing and Communications (GreenCom) and IEEE Cyber, Physical and Social Computing (CPSCom) and IEEE Smart Data (SmartData)
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